Wednesday, Joanna woke me by snuggling on me. When she saw I was awake, she gave me a kiss. "Had fun last night?"

"Mostly," I said with little enthusiasm. First thing in the morning was when I felt the worst about our evening activities. Joanna obviously didn't share my regrets or concerns. But then again, she wasn't making out with a sibling.

Joanna smiled. "I had fun kissing Paul. I hope that doesn't bother you. It wasn't anything serious to me, just some naughty fun. And it was what Kaitlyn asked me to do to try to improve things with Paul."

"How is you kissing Paul going to improve things between her and him?" The four us of switching for kisses wasn't sitting well in my stomach.

"Kaitlyn can't get him to listen to her about slowing down, but he listened to me. So now hopefully he'll go more slowly with Kaitlyn."

I didn't want it to make sense, but it did.

Joanna waited, as if she was expecting me to make a similar remark about kissing Kaitlyn. When I didn't make one, she said, "Look, I'm not going to judge you or Kaitlyn for what you did last night. I wouldn't have felt good about kissing Paul if you hadn't been kissing Kaitlyn. I would have felt like I was cheating on you. If it's not even, it's not fair." Joanna's face lightened. "An important part of my friendship with Kaitlyn is that we don't judge each other. She's okay with whatever I do; and I'm okay with whatever she does, including kissing you." Joanna chuckled. "And did you get her worked up with your kisses. I could tell she didn't want to stop kissing you. But she had to because you're mine, all mine." Joanna chuckled some more.

Kaitlyn had been so eager to kiss with me. And it had been so damn good kissing her...

I asked, "You're not going to tell anyone I kissed Kaitlyn, are you?"

Joanna snorted. "Of course not. I'd do nothing to hurt Kaitlyn. And when I talked about the plan with Paul on the boat yesterday, I made him promise to never tell anyone. Did you enjoy it?"

"What?"

"Kissing Kaitlyn, you idiot!" Joanna said with a smirk.

I didn't want to tell her yes, but I didn't want to lie. I went with downplaying the truth. "It was enjoyable. I'd never have done it on my own, but I didn't mind it when she kissed me."

"The whole evening was enjoyable. I'm looking forward to doing it again tonight."

* * * *

We did jet skis after breakfast. At one point, Kaitlyn suggested she ride with me and Joanna ride with Paul. Once we were away from the others, Kaitlyn said, "Thanks for going along with everything last night. I think it was a good lesson for Paul. He was more flexible about having sex last night than he usually is. I hope you aren't upset about Joanna kissing Paul."

"I'm not. I'm not comfortable with it, but I understand why we did it. Joanna enjoyed it. She views it as innocent fun."

"Good." Kaitlyn gave me a squeeze. "Stop for a minute. I want to get wet."

I brought the jet ski to a stop. Kaitlyn jumped into the water and swam around for a minute. She then came over to the jet ski, put her hand on it, and looked up at me. I asked her, "What does Paul think of what you and I did last night?"

"He didn't say. He probably thinks it was disgusting and weird." Understandably so. "Was he bothered by it? I don't know. He's a very simple guy; as long as he can play his game and have sex, he's happy. I can tell he's enjoyed the fashion shows, and that he liked kissing Joanna. And we had awesome sex last night, which made him very happy. Did you and Joanna have awesome sex?"

I blushed a little. "We did."

"Great! Paul was probably too focused last night on having a good time with Joanna to have a reaction to you and me. And I don't think he'll say anything negative for fear that all of his fun at night will come to an end."

All of that made sense. Kaitlyn then did something I've seen girls do countless time - pull her top out for whatever reason. This time when she did it, she gave me a brief view of her tits. She was looking at her top when she did it, so she may not have realized I could see her tits. Or maybe she didn't think my seeing her tits briefly was a big deal after I had gotten a good look at them the other night. Part of me felt that I shouldn't look, but I couldn't resist looking as she had sensational tits. Her show was another one of the things that shouldn't happen whose happening made my head spin.

I asked, "Are you thinking better about Paul after last night?"

"Too early to say. Paul is the first boyfriend that I've accepted as he is. Despite his flaws, he's a good boyfriend. But he's not a great boyfriend. If I knew of a guy who I'd thought would make a great boyfriend, I'd dump Paul in a heartbeat. What I don't want to do is dump Paul and then date a guy that I can manipulate without really trying."

"You're that manipulative?"

"I don't know if I'm so manipulative or if that I'm so good at it." Kaitlyn's face turned very serious. "I've learned the hard way that you can't trick someone into being a better person, or into making the right life decision. I can't change people; they'll only change when they want to change. I've felt much better about myself since I've started dating Paul because I haven't tried to change him. And I was open and honest with you and Joanna about why I wanted you two to date."

"Manipulating us into dating would have been bad."

"You say that, and I see how much happier Joanna is now that she's dating you. I took a big risk in asking you to date her."

Was she saying that manipulating was a good thing? "We would have figured out eventually that you had manipulated us, we would have been pissed at you and it would have hurt our relationship."

"And your relationship is great without me doing any manipulation?" That smarted. I opened my mouth to rebut her comment, but I couldn't think of one. Kaitlyn then said, "I used to think in too many cases that the ends justified the means. Or maybe I used to enjoy manipulating people more than I do now. I don't like it when I do it now."

"So don't."

Kaitlyn laughed. "Good suggestion. I try. Then things don't happen the way I want them to happen. Look at you and Joanna. Joanna won't accept that you're dating her because you want to. She thinks you're only doing it because of me. That drives me crazy as I think you're a great couple. It's the type of situation where I'm tempted to accept the ends justifying the means." Again, I had the feeling that she was a lot deeper than most other girls. She shook her head. "I wish now I could have had her come over when you were home, had you two hit it off, and then you decided to go out on your own."

"But that wouldn't have happened. I wouldn't have dated Joanna if you hadn't asked me to."

"Yeah. It's just that...I've come to realize that Joanna needs to make her own choices. Even if I'm totally certain about what she should do next, I need to let her to come up with the idea on her own. Hopefully at some point she'll choose to let herself fall in love with you."

Another painful topic. "I hope so, too." But I had no idea when that would happen.

"Thanks for not judging me. I think there aren't many guys a girl could tell that she's very manipulative, and they'd not judge her for it. I haven't told Paul about my habit of manipulating."

I shrugged. "If I got angry at you, how could I date your friends?" Kaitlyn giggled. "Seriously, I've been hanging out with two non-judgmental women this summer, so I'm learning to be non-judgmental."

Kaitlyn climbed out of the water. When she got back up, I asked, "Don't you think it's weird for me to be getting you excited every night?"

Kaitlyn shook her head sadly, "I think it says more about how bad things have gotten between Paul and me that I find innocent kisses from you much more exciting than what foreplay he does." Kaitlyn grinned. "We're all having fun. For whatever reason, it's like we've all gotten blank checks, during that one hour, to have fun like we'll never have anywhere else. I'm never going to kiss you at home. Joanna is never going to kiss Paul after this week. I like the freedom we've been having, and I'm looking forward to more freedom tonight."

* * * *

When Kaitlyn and I finally got back to the rest of the group, Mom and Dad gave us disapproving looks for being gone so long. We were suppose to swap jet skis every twenty minutes or so, and Kaitlyn and I had delayed this swap. Paul and I hopped on the small jet skis and raced each other. We played for a while longer before heading back for lunch. The rest of the day was pleasant and completely normal. The only slightly unusual thing was that after dinner Paul volunteered to do all the laundry, and Kaitlyn asked Joanna to help him to make sure "he washes the girly stuff correctly".

I found the normality of it all disturbing. I had kissed my sister last night. I was going to kiss her again tonight. I felt like people should be acting differently because of it, but no one was.

As soon as Mom and Dad left, the girls went into Kaitlyn's bedroom. Paul and I got the chairs into position and sat down. I asked, "Did you have fun today?"

"I did". Paul winked at me. "And I'm hoping for even more fun tonight."

The door to the bedroom opened, and the girls came out again in crop tops and terry cloth shorts. Everything was basically a repeat of the night before - Kaitlyn came to me for kisses, Joanna came for French kisses, and Kaitlyn came back for neck nibbles. When I reached my usual stopping point, I looked up and saw Joanna lolled against Paul again. There was something about their familiarity that bothered me.

Paul called out, "Keep going!" and laughed. What an ass! I couldn't believe he wanted me to continue to make out with his girlfriend.

Then I had an idea - I'd get back at Paul by driving his girlfriend crazy. Suddenly, I wanted Kaitlyn to dump him in the worst way. I'd get Kaitlyn superexcited so the next time she was with the big doofus, she'd be so frustrated with his pathetic foreplay that she'd kick him to the curb.

I moved back up to Kaitlyn's neck and started kissing upwards from about halfway up. When I got close to her ear, I gently nibbled on her earlobe.

"Oh my God!" gasped Kaitlyn.

I inwardly smiled. I nibbled a few more times on her earlobe while I listened to her breathing quicken.

Kaitlyn gushed, "You're giving me goose bumps!" She sounded shocked at how much I was exciting her.

I blew softly in her ear and got another gasp. I went back for another nibble when I heard Paul say to me, "Check out her nipple!"

I looked down, and it was easy to see through Kaitlyn's thin crop top that her right nipple was completely erect. There was something about clearly seeing the outline of her nipple and that it was so stimulated because of me that greatly excited me. It looked so perfect, so inviting...

Paul said to me, "Go ahead and feel it."

I looked over and Paul had his hands on Joanna's tits under her crop top. Part of me was instantly jealous, but then it was like my hands moved on their own accord to slip under Kaitlyn's crop top. I gently cupped her tits and...

...I completely forget about everything in the world except Kaitlyn's tits. They felt perfect in my hands - just the right shape, the right size, and the right amount of heft. I savored their perfect-skin smoothness as my hands moved over them. I heard Kaitlyn suck in her breath. Initially, her left nipple wasn't fully erect like the right, but I quickly got it erect by tweaking it with my fingers. I felt like a kid in a candy store - that wasn't quite right, but it was close; I had the feeling that I had free reign to hold and squeeze something that I had deeply wanted to touch but had thought I'd never would. I had admired my sister's tits for years, and now I had my hands on them with her approval, and apparently the approval of her boyfriend and my girlfriend.

Kaitlyn turned and looked up at me, an inviting look on her face. I felt like I was falling as my lips moved slowly towards her. Down, down, down I slowly went until my lips touched hers.

My lips had barely touched hers before Kaitlyn pushed her tongue into my mouth. I opened my mouth wide and let her tongue in as I continued to squeeze her tits. This was so hot, so crazy; to be Frenching my sister like this. And she wanted it; she totally wanted me doing this - her tongue was dueling mine fiercely; she was pressing her tits into my hands; she was moaning every time I squeezed or tweaked. I was totally inflamed with lust, and I needed to fuck. I needed to fuck right now.

I broke off the kiss and looked over at Joanna and Paul. They were Frenching and groping like Kaitlyn and I were. Joanna must have noticed me looking at them as she broke off their kiss and stood up. She grabbed her crop top, pulled it over her head and threw it aside. She grinned mightily as she walked towards me while swaying her hips sexily. When she reached me, she took my hand and pulled me towards the couch. When we got to the couch, she pushed me to lie down the length of the couch on my back. She grabbed her shorts and slowly pulled them down while wiggling her ass. It was a crazy sex show. I stared at her neatly trimmed, dark brown bush while she slowly pushed her shorts to the floor.

Joanna stepped out of the shorts and came on to the couch on her knees. She straddled my face and commanded, "Eat me." I stuck my tongue upward and parted her pussy lips. Her pussy was full of moisture - the wettest I could remember her being. I ran my tongue up and down the full length of her pussy, exploring how wet she was. I liked Joanna's taste and slurped up her juices as quickly as I could. I brought my hands up to cup Joanna's ass to help her balance. I'd done oral sex on Joanna many times, but this was the first time she had ever sat on my face like this.

As I slurped, I suddenly heard Kaitlyn's voice say, "Fuck, yeah!" Based on the loudness, she was close by - definitely not in her bedroom. With Joanna's legs pressed lightly against my ears, it was hard to place where the sound had come from. I gave Joanna a couple more licks before I heard Kaitlyn say, "That's it! God, yes. Lick me, Paul! I'm so damn wet!"

I pictured this part of the living room - the coffee table to my right was the center of the furniture here. Above my head was the TV and on the opposite side of the TV were two comfy chairs that had low, U-shaped backs and thick cushions to sit on. It was from there that I decided I was hearing Kaitlyn. Knowing that my sister was having oral sex and was probably naked so close to me drove me wild. I redoubled my efforts to make Joanna cum.

I made a series of quick licks around Joanna's clit as Kaitlyn continued to moan. I had no idea how I was doing as this was a new position, and I couldn't hear Joanna's breathing over Kaitlyn's loud moans. I took a break from focusing on eating Joanna out to look upwards. She was holding her upper body straight, and her body seemed so long from this angle. She had her right arm on the couch back to help her keep her balance. Her small tits really stood out from her chest. I took a mental picture and stored it away as one of life's precious memories before I returned my focus to making her cum.

As my tongue danced around Joanna's clit, I listened to Kaitlyn continue to moan. The two couples having sex like this was incredibly crazy; like something out of a porn movie. What would Joanna do once I made her cum? Would she fuck me in front of Paul and Kaitlyn?

Kaitlyn's moans got even louder. "Oh! Oh! Oh!" It was incredibly erotic to hear my sister's cries of ecstasy. She sounded close to cumming. I had no idea how close Joanna was, so I continued frantically working her clit.

I heard Kaitlyn yell, "Yes!" and then she was quiet. A few moments later, I heard movement from that part of the room. Were they going to fuck in the chair right next to us? Then I heard them moving away from us and the door to bedroom close. Shortly after that Joanna came, flooding my face with her juices.

After Joanna clambered off me, I sat up. Joanna grabbed her clothes off the floor and said, "Let's go to our bedroom." I noticed Kaitlyn and Paul's clothes were still strewn all over the floor. Joanna smiled and said, "They'll have to pick them up later."

* * * *

The next morning Thursday, I was awakened by the sound of someone entering our bedroom. I looked up to see it was Kaitlyn, dressed in her crop top and shorts from last night. Joanna was snuggled against me on the wall side, so I had an unobstructed view of Kaitlyn.

Once Kaitlyn saw I was awake, she said quietly, "Good morning!"

I shook my head. What was Kaitlyn doing in my room? She had never come into my room when I was with a girlfriend before. From the light, it was probably ten minutes before Mom would knock on our doors. As much as I loved my sister, I didn't want her seeing me and my girlfriend in bed naked. It bothered me that another social rule was being broken. "What are you doing here, Kaitlyn?"

I noticed Kaitlyn had something in her hand, which she dropped on the floor. Joanna was awake now, and she partially sat up so she could see.

Kaitlyn said, "Last night, Paul got a look at Joanna's naked backside. I want to keep things even." With that, she turned around. She grabbed her crop top, pulled it off and dropped it on the floor. She grabbed her shorts and pulled them slowly down while sexily wiggling her ass like Joanna had done the night before. Joanna laughed good-naturedly. I admired Kaitlyn's beautiful ass as she put on her show. She was a curvy girl and had a full, nicely-rounded ass. Her firm ass cheeks practically begged to be squeezed. Kaitlyn has to be the sexiest woman in the world. Eventually, Kaitlyn was squatting on the ground. There was enough light that I could see her stepping into something. Then she was moving upwards, swinging her ass side-to-side again, as she slowly pulled up her bikini bottoms. When she reached her full height, she pulled the bottoms into position. In her hand was her top, which she quickly put on while continuing to face away from us. She gave us a look over her shoulder, smiled, and said, "See ya soon."

Joanna said, "Kaitlyn! I'd like to have a long talk with Brandon. Could you cover for me at breakfast?"

"Sure. Talk as long as you want." And then Kaitlyn slipped out the door.

I looked at Joanna. I was curious as to what she wanted to have a long talk about. Last night, we had crashed right away after we had fucked, so there hadn't been a chance to talk.

Joanna said, "I want to talk about last night. It went waaay further than I was expecting. While you were kissing on Kaitlyn's neck and shoulders, Paul asked me several times if he could feel my tits. I said no, that we could only do what you and Kaitlyn were doing. Paul told you to feel Kaitlyn's tits so he could feel mine. He was happy when he saw you kiss Kaitlyn as that meant he could kiss me. Everything had me so excited I had to have sex right there and then."

So Paul had been more than fine about what Kaitlyn and I had done. Probably thought it creepy, but was happy to ignore what we were doing if he could do what he wanted with Joanna. I was not in a happy mood.

Joanna smiled at me. "I've said it before and I'll say it again; it was all harmless fun. This morning, I wanted to tell you why I think that. I have three reasons, the most important of which is you're my guy; you're the one I want to have sex with, the one I want to sleep with, the one I want to wake up with, the one I want to have fun with." That made me feel warm all over. Joanna had never declared her affection for me so strongly before. "Reason number two is that I trust you and Kaitlyn. You aren't going to do anything to hurt me. Hopefully you trust me to not do anything that hurts you."
I liked how this talk was going. "I do, Joanna." And then I asked, "Do you trust Paul?"

Joanna chuckled. "No. Well, sort of. I think he'll keep his word, but he's very aggressive about making out and will push things if he sees an opportunity to do so."

"Like last night."

"Yes. I'm glad you were there to keep him from going too far. But it doesn't really matter as he'll be out of the picture soon."

"Oh really?"

"Yeah. I watched him and Kaitlyn, and he doesn't excite her at all. I think she'd dump him this morning if there was some convenient way of sending him home. But there isn't, so she'll try to make their relationship last until we get home."

I nodded. That made sense, and I was glad that Kaitlyn would dump Paul soon.

Joanna said, "This week has been a perfect storm. I think whatever you and Kaitlyn do is harmless because I trust you, and I think whatever Paul and I do is harmless because I probably won't see him again after this week. And I think it's important that we switch partners up so Kaitlyn can be happy as she keeps their relationship on life support." Joanna smiled. "I like alternating as I have fun with Paul, and then I have even more fun with you."

I smiled at that.

Joanna tapped her finger on my chest and said in a light but commanding voice, "So don't expect anything like this to happen again. You're to never kiss another girl besides Kaitlyn, and you can only kiss her the rest of this week. After that, you're my guy full-time. Understood?"

Exactly what I wanted to hear. I kissed Joanna and then said, "Understood."

"Good." Joanna smiled. "There's something else I wanted to discuss. The other day, when Kaitlyn was discussing how Paul bought her so much stuff, it probably sounded very mercenary to you; like she's only dating him for the money he spends on her. And now that she has so much stuff, she's lost interest in him."

I thought back to the moment. "It did sound that way."

"There are two reasons why a girl wants a guy to spend money on her. One is that she wants to raise her lifestyle. I've done that. I hate being poor relative to all of my friends. I've dated guys primarily because I wanted them to spend money on me."

"And they were jerks."

"The ones I dated were. But there are nice guys who are happy to spend money on you. There's a reason why young women marry rich guys who are old enough to be their fathers - financially security has a lot of appeal in a world where men have more wealth than women. If I dated someone like Paul, his willingness to spend money would go a long way towards keeping me happy. But I don't think that's what Kaitlyn is looking for."

This was interesting. "What is she looking for then?"

"I think she views Paul spending money on her as a sign of affection, and she's looking for an openly-affectionate guy. They have this great synergy in that he likes buying her sexy clothes, and she likes dressing up sexy for him. The Friday Paul was arriving to spend his first weekend, Kaitlyn was so excited about dressing up sexy for him that she couldn't resist sharing with the rest of us at the office. That was her first fashion show there." I wished I had seen it. "But Kaitlyn doesn't need expensive clothes to dress sexy. You saw that last night."

"I did. She looked very hot last night." I belatedly added, "And so did you."

Joanna rolled her eyes slightly. "So her not being excited about Paul now isn't due to how full her closet is." Joanna looked thoughtful. "Something has changed since the end of college. Any idea what?"

"No." I was little surprised our conversation had taken this turn. "I spent very little time with them at school."

Joanna sighed. "Well, Kaitlyn will probably tell me everything next week." She started climbing over me. "Time to go help make breakfast." Once she was out of the bed, she threw on her nightshirt and said, "I'm so happy now. I wish Kaitlyn was happy with me." And then she left.

I lay on the bed, thinking about our conversation. A weird side effect of our group make-out sessions seemed to be that Joanna was much happier with our relationship, much closer to saying 'I love you.' Was it because the sessions required me to trust her so much? Whatever it was, I felt good about last night's session even though Kaitlyn and I had gone way, way over the line. If everyone else was fine with it, why shouldn't I be?

* * * *

When I came out for breakfast, Mom gave me a concerned look. Was she worried about Joanna and I having a long talk? Or did she suspect what the four of us were doing during her and Dad's walk?

During the morning's water skiing, Kaitlyn and Joanna regularly changed sides of the boat, and we guys almost always talked with whoever was sitting next to them. Kaitlyn was very happy when she talked with me. She didn't look happy when she was talking with Paul.

When the morning's water skiing was done, Kaitlyn had Joanna stay behind as the rest of us headed up to lunch. When the girls came in the lake house, they were giggling. Shortly thereafter, Kaitlyn told Mom that she and Joanna were going to go shopping after lunch and asked what was needed from the store. After Mom ate, she made a list and went over it with Kaitlyn.

I asked Kaitlyn, "Can I come with you?"

She gave me a smirk, and said, "No. It's a girls' shopping trip."

Once we were all done eating, I walked Joanna down to the minivan. She got in the passenger side, lowered the window, and said with an impish grin, "We're going to do some naughty shopping." She gave me a kiss, and then she and Kaitlyn were gone.

* * * *

The afternoon wasn't much fun without the girls as I was beginning to loathe Paul. The girls didn't get back until almost time to make dinner. Over dinner, they were all giggles. Or Kaitlyn was all giggles - Joanna swung from giggling to being nervous or anxious. But both were giggling madly when they went to Kaitlyn's bedroom after Mom and Dad had left. Paul and I waited impatiently for the girls to come out as we didn't have anything to say to each other. As every other night, Paul and I were wearing shirts, shorts and no shoes.

The door opened, and I turned to see Joanna stride out. She was wearing white high heel shoes; red panties that were cut low at her crotch and high on her waist; a shiny, plastic black belt; and the only thing above the belt was a raspberry-colored beret. She looked super hot. And then Kaitlyn came out behind her dressed the same and turned the hotness up to eleven. She had great tits and just a sexy air about her. Watching her walk had me rock hard.

Joanna and Kaitlyn walked to in-between Paul and me as usual, and I was mildly surprised when Joanna turned towards me. I heard Kaitlyn say to Paul, "Be a good boy and you'll get your reward later." And then Joanna was on my lap.

Joanna kissed me on the lips, and our kisses quickly became very hot; short kisses with lots of passion. It was weird that kissing my girlfriend was now a hot, novel experience, but this week was weird. I had no idea of what the limits were. With the way the girls were dressed, we were clearly getting crazy tonight, beyond what we had done before. I decided to stay with the same limits as the first round last night.

After a few minutes of kisses, I stopped and leaned Joanna back from me. I said, "What a naughty outfit." Joanna wore high heels to work, but she'd never worn them on a date with me. The panties and belt were gaudy and looked cheaply made. I suspected the girls tried to spend as little as possible on their outfits and had picked clothes they felt they would look equally good in.

Joanna blushed a little. "You like it?"

"I love it. You look so hot in it, so very naughty." Joanna beamed in pleasure. "You like being my naughty girl, don't you?"

"I like being naughty."

"You look good enough to eat," I said as I moved my mouth slowly towards her tit.

"Not yet," said Joanna as she intercepted my head and brought my mouth up for another kiss.

We kissed for probably another minute before Joanna stood up. She turned and walked across to Paul, and Kaitlyn walked across to me. If Joanna looked hot, then Kaitlyn was on fire. The belt around her waist and the high-cut red panties emphasized her narrow waist and curvy hips. Her perfect tits swung gently side to side as she sashayed over to me. My opinion that my sister was the sexiest woman in the world was reconfirmed.

Once Kaitlyn was on my lap, she leaned back to give me a good look at her. "You like?"

"I like. You're an incredibly sexy woman. You could make a blind man see dressed like that."

Kaitlyn laughed before coming in for a kiss. During our next kiss, I pushed my tongue forward between her lips and she eagerly opened her mouth to accept it, moaning once my tongue was in her mouth. I had been unprepared for Frenching with my sister last night, but I was ready and eager tonight. I knew it was wrong; I knew I shouldn't, but the other three were pushing me to do it and, damn it!, I wanted to do it. And I loved it - I loved holding Kaitlyn close, the feel of her skin and most of all the sensation of our tongues frolicking together while our mouths were locked. I had never enjoyed kissing someone so much before. The kissing had my cock almost painfully hard. The wickedness of passionately kissing my sister in front of my girlfriend and her boyfriend while my parents were blissfully gone on a walk was driving me crazy. It was sick, weird and immoral, but it was also incredibly erotic.

Kaitlyn shifted her weight as she kissed me, so that my cock was now pressing against her pantie-covered pussy. Had she intended that? No, she couldn't have intended that as this round was to be kissing with nothing sexual.

Then Kaitlyn shifted her weight again, rocking her hips forward to press more of my cock against her pussy. And then she rocked back, relieving the pressure. She continued lightly rocking back-and-forth as we frantically kissed. When I had thought kissing my sister was as hot as it could get, she managed to turn it up hotter.

Kaitlyn stood up suddenly. I could have kissed her for hours, but I knew she and Joanna had a plan for the evening. Were they even bothering to try to teach Paul better foreplay technique? I watched Kaitlyn's ass as she swung it slightly back-and-forth on the way back to Paul. The panties covered about half of her ass cheek, providing some shaping to an ass with great shape.

When Joanna straddled my lap, she said, "Hands, no mouth." I assumed she was stating the rules for how I could touch her tits.

"May I kiss?"

"You certainly may," said Joanna as she lowered her mouth towards mine. As we kissed, I brought my hands up, cupped her tits and gave them a light squeeze. We did a series of soft kisses that ended in loud smacks as I gently explored her tits. I didn't know if Frenching was permitted during this part, so I decided to let Joanna initiate any tongue. When I squeezed her nipples between my fingers, Joanna pushed her tongue against my lips. I brought my tongue forward and met her tongue outside of my mouth. We had a sort of sword fight with our tongues (a tongue fight?). It was silly and childish, and a lot of fun. After the extreme sexual intensity of making out with Kaitlyn, it was good to have fun. I felt a swell of affection for Joanna - she really was a great girlfriend.

I stopped the tongue fight, moved my hands aside and said, "You have wonderful tits."

"Kaitlyn's are better." Joanna was obviously bothered by her best friend's anatomical superiority.

"So? She has wonderful tits, and you have wonderful tits; just different types of wonderfulness. And your tits suit my naughty girl."

Joanna stood up. "Thanks." There was more sadness in her voice than happiness. I smiled at her, trying to show her how happy I was to have her as my girlfriend. I watched her as she walked over towards Paul. She had great legs - better than Kaitlyn's - and they looked even better in the high heels. She had a very nice ass. A little before she got to Paul, Joanna looked back and saw me looking at her.

Kaitlyn was by my side. To my surprise, she didn't hop on my lap. Instead, she looked back at Joanna and smiled; then turned back to me and said, "Stand up."

I stood up and looked over to see that Paul was doing the same.

Kaitlyn grabbed the bottom of my shirt and pulled it upwards. I bent forward so she could take it off me more easily. Once the shirt was off of my head, I looked over and saw Joanna doing the same to Paul. The girls dropped to their knees while looking at each other. They nodded to each other and turned back to their man. I looked down to see Kaitlyn grab my shorts and pull them down. She grabbed my boxers and pulled them down too. As I stepped out of them, I looked over and saw that Paul was naked like I was.

Kaitlyn stood up while pressing me back onto the chair. Once I was seated, she straddled my lap and kissed me hard on the lips. As soon as her tongue was in my mouth, I squeezed her tits. The sexual intensity was back up to eleven. Kaitlyn broke off the kiss, put her hands behind my head and hissed, "Suck them!" as she pulled my mouth to her nipple. Kaitlyn moaned as soon as I started sucking. I felt like a starving baby who was desperate to nurse.

"That's it, Brandon. Suck on my tit." Kaitlyn ran her fingers through my hair as she kept up a quiet monologue. "It feels so good. I've been wanting you to suck on my tits since I watched you suck on Joanna's tits while Paul slobbered on mine." Her fingers running over my scalp were giving me thrills. "Oh, yeah. I so like that." I stopped sucking on Kaitlyn's tit and instead kissed around her nipple, giving a little suck with each kiss. "Damn that feels good, you sneaky bastard. You don't know what you do to me, Brandon. I love it. I love the feel of your mouth on my tit. Time to suck on the other one." Kaitlyn shifted me to her left tit. "You've got me so excited, Brandon. I'm probably sopping wet."

Kaitlyn shifted her position and again my cock was pressed against her pussy. She started rocking her hips back and forth, grinding her pussy against my cock as I sucked on her tit; only the thin material of her flimsy panties was keeping us from having sex.

Kaitlyn said in a quiet voice full of passion, "I want to fuck you, Brandon. I want to feel your dick inside of me. I want you to make me moan, make me scream. I want you to cum inside of me, to fill me with your cum."

I couldn't take it anymore. I pushed Kaitlyn off of me and stood up. I had to end it now or I'd be throwing Kaitlyn down on the couch and ripping her panties off. I looked over at Joanna and Paul - Paul was slobbering on her tits enthusiastically while Joanna was running her fingers through his hair. It took me a moment to catch my breath enough to say, "Joanna, let's go to our bedroom."

I held my hand out to Joanna as I started walking towards our bedroom. She hopped off of Paul and walked quickly over to join me. I couldn't look at Kaitlyn - she had pushed me past what I could take from her, and I had to get away.

Once I had closed the door, Joanna dragged me by my cock over to the bed. She sat down on it and took my cock into her mouth while I stood. She bobbed two or three times before I exploded in her mouth. I came and came and came. I didn't know I could make so much cum. Joanna kept bobbing her head, sucking it all down.

Once I was spent, Joanna moved back on the bed and started removing what little she was wearing. "Someone was excited. Did you have fun with Kaitlyn tonight?"

I saw no point in denying it. "I did. That was crazy. Too crazy. Did you have fun with Paul?"

Joanna was naked now, and she patted on the bed for me to join me. "I did. I was very naughty with Paul tonight. He wants to fuck me. Do you want to fuck Kaitlyn?"

I felt like a huge pit had opened up in front of me. That was the obvious direction our make-out sessions were going. And Kaitlyn had enthusiastically endorsed the idea of me fucking her. "I can't, Joanna. She's my sister." I closed my eyes. It was painful to think this hard about the subject. "It's wrong. And what if our parents found out. Or people at—"

Joanna put her hand on my leg and said, "Relax. I'm not asking you to fuck Kaitlyn. She and I agreed before tonight that we'd never have sex with someone who wasn't our boyfriend; no oral either way and no fucking. Tonight was probably as far as we'll ever go." Joanna's hand slipped up my leg and grasped my cock. "So I'm asking you a hypothetical question; do you want to fuck Kaitlyn?" My cock started stiffening as she stroked it up and down. "Do you wish you could fuck Kaitlyn, even though you can't because she's not your girlfriend?"

I couldn't avoid the truth. "Yes, I wish I could fuck Kaitlyn. I'll never do it, but I definitely want to do it."

Joanna released my cock and swung her body over mine. I was lying on my back and now her crotch was on top of mine.

I asked, "Are you happy with that answer?"

Joanna positioned her pussy lips on top of my cock and started sliding back and forth on my cock. She looked down at me and smiled. "I am. I'm glad you're so honest with me." Joanna partially sat up, putting her hands on my chest and leaning on me so she could slide her pussy more easily up and down my cock. I was completely hard again. She just smiled at me as she continued gliding her pussy back and forth. And then she stopped gliding and rose up on one leg. She grabbed my cock and guided it to her pussy before slowly sinking down on it.

Once I was fully embedded in her, Joanna said, "Now fuck me like you want to fuck Kaitlyn."