Very important note: I've always loved accidental penetration stories even if they're usually not realistic. And so this is a very lighthearted story. It's not meant to be an accurate representation of something that could actually happen in real life! On the other hand, around that highly improbable incident, I'll try to make the story as interesting as I can. If that's not your cup of tea, find another one of my stories.

Second warning: while there's no anal in this story, there's some teasing about it.

Edited by Pope1944. Thanks!

*****

Dustin woke up in his bed on the morning following the ball. He was alone in the room, Emily having already gone out. It was pretty late already and while Dustin was usually an early riser, the late night at the ball and the booze explained his long sleep. After opening the blinds, Dustin rubbed at his face and hair as he yawned. He decided to remain alone for a bit.

Here at the colony, he hadn't had much alone-time so far. He stayed in his room for about an hour, trying to understand what sort of strange phenomena could explain what was happening to him. Three accidental penetrations in three days. That just couldn't be coincidence. It was impossible. Dustin loved reading accidental penetration erotic stories, but even as stories they were rare! Real world accidental penetrations were bound to be exceedingly rare! And yet, three times in three days!

But try as he might, Dustin couldn't figure out why it was happening to him. He wasn't complaining, of course, but still... He then thought about what Lily had said to him as they entered the ball yesterday. So she knew about him and Emily. Dustin wasn't all that surprised: he knew the twins didn't keep secrets from one another.

The way she had grinned after whispering in his ear had led his mind down erotic paths. His slightly perverted and hormone-filled brain had briefly wondered if Lily had been interested in having sex with him. Alas, that wasn't the case. While she wasn't shocked to the point of calling the police or alerting their parents, she found the idea of incest profoundly weird. Dustin had come extremely close to telling her that he knew she listened to porn with her sister.

In the end he had refrained. Before they moved to another subject, she had also mentioned that Emily had loved the experience. Dustin had flushed at that comment and had asked Lily to stop talking about it otherwise he would have an erection. Right into his ear, she had then said "An erection about your sister? How perverted!" Despite her joke, Dustin could see that she was troubled by it all.

And it was puzzling him this morning. Sure it was totally normal to think that incest was weird. Wrong even. Yet Lily had always been the wilder twin. Edgier. More outgoing. Maybe it came to be that way because she wanted to prove that she was the older one, by less than an hour of course, by pulling crazier stunts. But when it came to this accidental yet very pleasurable sex between siblings, she was recoiling. Very peculiar.

When Dustin finally came out of his room and walked into the glorious, sunny day, Lily ran to him. Seeing her running completely naked in the sun like this awakened something inside him. Something between his legs. The twins were thin and very fit, and with her long dark hair flowing and whipping behind her, Lily looked remarkably sexy. "Dustin! You're my savior!" she cried. "You have to come with me to the beach!"

"Uh?" he grumbled before clearing his throat. "The beach is right there," he added, pointing to the lake.

"No! The real beach!"

"Oh. The ocean?" he asked.

"Yeah! Nobody else wants to come with me," she said with an exaggerated pout.

"You can drive there yourself now. Why dont—"

"Because it's boring alone. Please! Pretty please?"

Dustin was pretty sure that Lily wasn't aware of just how sexy she looked. Her hair were slightly wet from a previous swim and Dustin loved that wild, disarrayed look. She was breathing hard, as had her twin sister a few days ago after her climax. She had also interlocked her fingers together in front of her mouth and so placed her arms against her breasts. Those very round firm breasts, that Dustin happened to know exactly how they felt, were now squashed and looked bigger than they were.

Given that sexy look and the fact that he had thought a lot about the great sex he'd had with Emily this morning, Dustin knew he was in danger of getting an erection. And a day at the real beach with her didn't sound so bad in any case. "Sure," he said.

"Great!" Lily replied before hugging him reflexively.

After feeling his cock against her pussy and his chest against her breasts, Lily startled and pulled away. "Crap!" she laughed. "I'm sorry! But thanks!" She then ran back towards the lodge. "Oh!" she said, pausing for a moment and looking like a proud young colt with her long legs and wild mane. "We're leaving right now!"

Dustin sighed and smiled. He went back to the lodge after her and found the single pair of shorts, t-shirt and swimsuit he had brought. The beach wasn't a nudist one. Twenty minutes later the two of them were in their parent's car, on their hour long journey. They talked on the way there, but nothing particularly intimate. Lily made small talk and Dustin um-hummed a lot.

At the beach, as she got out of the car, Dustin looked at his sister stretching. With her bikini on. For nearly a week now, he had seen her naked every day. "Gods, it's strange to see you wearing a bikini," he said.

"I know!" she replied gaily. "Same with you and those huge swim trunks!" she laughed.

"I feel very uncomfortable." Dustin replied.

Soon after that Lily ran to the water, looking once again like a young mare in the prime of her life. And nude or not, that black bikini was sexy as hell. As he swam about close to her, he thought about how nudity and sexiness were two very different concepts. He had seen everything his sister had to offer in the past few days. More if he counted the fact that he had fucked her twin. But his eyes nevertheless kept darting back to that black bikini.

After a while they were back on the beach on their towels. Dustin asked his sister "Ever thought about going full time nudist?"

"Even back home?" she asked. "Yeah. I think I'd be up for that. Of course we'd have to build high fences around the backyard and put blinds over our every windows!" she laughed. "What about you?"

"And get to see you three naked all the time? Count me in!"

Lily guffawed as she slapped him on the shoulder. She said "Pervert!"

"What?" he defended himself. Whispering into her ear, he added "I didn't say I'd fuck you all!"

"What?" Lily cried, laughing now. "You guys are all the same!"

"Only for very pretty girls..." he replied.

"Oh, flattery will lead you nowhere with me, buster!"

The siblings spent most of the day at the beach, alternating between the water, the sand and the shade of the huge trees. At around 7 pm, there was a loudspeaker announcement that the beach was about to close. To their surprise, the two of them saw a lot of people getting up almost immediately and begin to gather their things.

"My!" Dustin said. "That's a bunch of obedient people!"

"Yeah... strange. Oh!" Lily said, understanding what was happening. "It's for the showers!"

"Oh crap!" Dustin said, getting up. "Let's go! Remember what happened last year!"

"Yeah!"

Last year nobody in their family had taken a shower before leaving. But the water around here was very salty and their skin had begun to itch madly in the car. And so this time Lily and Dustin dearly wanted to take that shower. So did everybody else! They ran to the closest shower area and managed to beat a lot of families. Nevertheless, as they arrived, there was only one stall left. Lily ran to it first and giggled as she entered and closed the door behind her. Dustin swore out loud. Still laughing, Lily opened the door once again, grabbed his arm and pulled him in.

"Just don't get any ideas, mister!" she said as she slipped her bikini top over her head. Unable to miss the firm bounce her breasts made after being pulled upwards, Dustin swallowed and said "Sure."

The stall was very small and they were cramped. It was pretty much impossible not to touch each other. Then again, they had spent the previous evening dancing together and Lily had felt his cock against her all night long. But Lily was in very high spirits, grinning as they tried moving about and soaping their bodies clean. "What will the others think?" Dustin asked. "Seeing a brother and sister together in this small stall!"

"They don't know we're siblings!" she replied as she pushed her bikini bottom down.

Doing so mean that she had to bend down and she was surprised to find herself very close to Dustin's cock. It was still soft, but was beginning to show signs of an erection. She stood up quickly, but was still smiling. "Keep that dangerous thing down! You never know if I'm going to slip!"

"Haha, very funny!" Dustin said, knowing she was talking about his accident with Emily. "But, seriously, I don't think I can keep it down being so close to you as we lather ourselves. It's just too much like a shower and showers are... er..."

"I know... Very erotic." Lily breathed before looking at him more seriously. "I don't mind, but, again, don't get any ideas."

"Fine. Of course."

But Dustin wasn't so sure about that. She had pulled him in the stall with her when he could have waited five or ten minutes outside for another one. She had decided to strip naked while they could have kept their swimsuits. And she did keep bumping into his cock. Was this all a set-up? Lily was the wilder one after all.

When she began to wash his back, Dustin was pretty sure that Lily had a naughty plan in mind. Then again, he decided to wait. A minute later she stopped washing his back and turned around. "My turn." she said.

"Lily..." Dustin began, but she cut him off.

"Yeah, I know. You won't be able to control it. It's alright. It's not as if I hadn't seen it hard on the first day!" she added, giggling.

"Curse that first day!" Dustin said theatrically.

He couldn't see her face and so couldn't judge her frame of mind. When he began washing her back, his erection simply surged. When the tip of his rising cock touched her ass, she jumped in surprise but laughed. Dustin said "Sorry sis... In a few seconds it's going to be out of your way..."

"What? You'll be able to make it go soft?" she whispered.

"No, no... It's just that it's going to be so high that it won't touch your ass anymore!" he replied.

When Lily began giggling at the thought, Dustin decided that she was teasing him and that she wanted what Emily had gotten. Which would be par for the twins: what one got, the other had to have as well. It seemed only logical that she had brought him here and had pulled him in here with her for that very purpose.

But Dustin knew enough about himself not to wholly trust his brain when he was this excited. And so he wasn't about to do anything like grabbing her ass. He dearly wanted to, but... In any case, if Lily wanted something to happen, she would make the first move. Otherwise, life would go on without him putting his foot in his mouth. Or his cock where it wasn't wanted!

"Hmmm..." she moaned. "You've got good hands Dustin."

Dustin felt bad for a moment as he noticed that by now he was caressing her body a lot more than he was washing it. "Yeah... Thanks."

"Did Emily enjoy that?"

Dustin swallowed when she asked that. "Er, I guess..."

"Regardless of what I think about this whole thing, she was a lucky girl." Lily said as he ass touched his cock again. She giggled again. Reaching her hand back to him, she said "Give me the soap, will you?"

At this point Dustin was grinning like a fool, knowing what was coming. And sure enough, Lily dropped the soap. "Fuck!" she said, but she was already laughing, fully aware of the irony. "Don't you dare do anything!" she said as she bent forward. If she hadn't said that, Dustin would have pushed his cock inside her. But he managed, somehow, to resist.

A second later though, Lily slipped on the wet floor and lost her balance, impaling herself upon his cock all on her own. She gasped but didn't cry out. It was the signal Dustin had been waiting for. He grabbed her hips and began fucking her sweet pussy. Once, twice, three times and more he fucked her delicious pussy. But to his shock and horror, he suddenly felt his sister slapping his hip with one of her hand before pushing herself off of him. "Fucking bastard!" she said as she turned around to face him, a look of outrage on her face. "I told you not to do anything!"

"I didn't!" Dustin replied, stunned.

Lily closed her mouth, as he was right. Then, breathing very quickly, she said "Then why did you grab me and... Oh fuck it... Forget about it."

But Lily put on her bikini in record speed and walked out of the stall. "Shit!" Dustin thought. "She really slipped! She really fucking slipped! For real! Four in four days! This is insane!" He finished his shower as his cock still twitched and as his mind still reeled with this impressive dose of pleasure. He put his swimsuit back on and wrapped his towel around his waist to hide his erection. When he arrived at the car Lily was already inside, looking very angry. She had tears in her eyes. "Fuck!" he thought for the hundred time in the last minute.

He sat in the car with her and said "Lily... I'm so sorry. I don't even know who to begin to apologize."

"It's fine..." she replied in a low tone.

"Obviously it's not fine Lily. The last thing I wanted to do was to hurt you. Think about it from my perspective. You pulled me into the—"

"Stop it. Just stop talking and start driving."

Dustin sighed. It took all of his self-control not to keep talking and trying to explain himself. He had tried doing that with Niemira before their relationship fell apart, and it had never helped. Sometimes people needed some silence and space to think. It was a very long drive back to the colony. When they arrived, Lily went directly to her room after asking him to send for Emily.

When he found her, she immediately saw that something had happened. Before he could even give his side of the story, Emily went to see Lily. She came back to his room twenty minutes later, looking somewhat angry. Dustin was surprised, as he had been expecting something a lot more intense. Ten minutes later, when he explained his side of the story, Emily wasn't angry anymore. Not even a little bit. She repeated what he had thought earlier "Fuck... She really did slip right onto you!"

"Did she say that I grabbed her forcefully?"

"No!" she replied quickly, trying to smother his worry.

"But you did grab her... even though now I understand why you thought she had been playing with you." She sighed. "Let me go and talk to her again."

Once again Dustin found himself waiting anxiously for his sister. When Emily entered his room fifteen minutes later, he got up and asked "Is she better?"

"Why yes, I am." Lily replied, a small smile on her lips.

Dustin could almost alway tell his twin sisters apart, but he was so nervous that he missed the subtle differences. He had also expected Lily to have red eyes. But she did not. He knelt on the floor and apologized again. "Lily, I don't even know what to say..."

"Shhhh. I'm alright now. Come here and sit with me." Once they were on the sofa, Dustin could see that she was still very nervous. She said "Look. I need to apologize Dustin—"

"No you don't. I'm the perverted monster here!"

Lily turned to him and looked him in the eyes. "Do you really believe that?"

After a pause, looking away, he said "No. But I do feel absolutely awful."

"Well, stop it. It took me a while, but with Emily's help I managed to understand why you may have thought that I was... doing that on purpose. But I wasn't."

"I know, I know..." Dustin said, refraining from apologizing again. "Can you believe how hard it was for me to believe that in a matter of day, both of my twin sisters just happened to fall on my cock and impale themselves?"

Lily looked up, a small smile on her lips. "Yeah. It does look strange. Especially given that I was aware of that first time..." She sighed. "So. I'm ok. You don't need to apologize. And I did tease you a bit in the stall. But, nevertheless, it's just too weird. Incest." She stood up and walked towards the door. "I know Emily liked it, but I just can't."

Standing up as well, still near the couch, Dustin suddenly thought that he understood what was happening. She was fighting herself. Taking a risk, he said "And what about when you do it with Emily?"

Lily's face fell. "You knew?" Dustin nodded.

She turned around, covering her face with her hands. She remained like this for a long moment until she took a deep breath. And to Dustin's eyes, she seemed to transform. She dropped her hands and stood straighter. She shook her hair free from her ponytail before taking a second deep breath. "Fuck it..." she whispered very faintly. And then she looked up at him.

Dustin had no idea what was going on, but he could see a difference in her eyes. As clear as day. Something had changed. She came back towards him and stood very close to him. "Oh, how strange we are. The three of us. A trio of incestuous siblings..."

Dustin refrained from mentioning that he had also fucked their older sister and mother. He wisely judged that it wasn't a good moment. "Listen Lily..."

"Oh gods I feel so bad!" she interrupted him. She didn't look like she was feeling bad though. "I'm sorry for making you feel so awful earlier. Here I was blowing things out of proportion. You know, I was indeed shocked that you had begun to fuck me. But... not that much. And your cock did feel fucking good!" She swore. "I'm such a bad girl!"

Dustin tried to get a word in, but Lily wasn't done. "Since Emily told me about you two, I just couldn't stop thinking about it! I even wondered if I could switch places with her one night and just fuck you without you being the wiser!" Lily laughed as she stared at Dustin.

Dustin was reeling from everything he was hearing. And Lily wasn't even close to being finished. "And it wasn't the first time I thought about fucking you. Emily and I sometimes even roleplayed doing it as we fuck! I'm sorry... I should have told you all of that earlier instead of playing the shocked virgin saint. As if I were a saint! My pussy was dripping wet, wasn't it?"

"Lily, I—" Dustin tried to say something despite his shock.

"Wait, I'm not done. If I have to come clean, I need to tell you everything. It's not easy, and quite shameful, so don't interrupt me. I love fucking Emily so damn much! You have no idea! But some part of me feels bad about it. Really bad. My head knows it's not morally right. Heck, it's even illegal! Part of my heart even knows it. There's something wicked in there..."

Lily paused for a moment, her eyes scanning the room without really seeing it as she searched for her next words. "Then again, many wicked things are also deliciously good, right?" she looked at him, fire in her eyes. "So I was torn, even with just me and Emily. And now this incident happens between the two of you and it sets my mind afire! Shit! Can you believe me when I say that even when I was pissed earlier in the car, I couldn't help remembering just how good your cock had felt inside me? Had you noticed that I let you fuck me quite a few times before slapping you away?" She paused for a moment before asking him "So, am I a monstrous little bitch?"

Dustin was surprised at her outburst, but right now all he could think about was that she actually wanted to fuck him. And his cock was thinking the same thing. As it was rising from between his legs, Lily noticed it in turn. "Oh..." Looking up into his eyes, she said "I'm guessing you're not pissed?"
"I am, but I wanna fuck you more. So much more."

Her eyes opened wider when he said it out loud. She was breathing quicker now as she said "Let me make it up to you. Let me apologize for being such a bitch by being the best bitch I can be. Your bitch." She then slid to the floor and knelt in front of him. Dustin's mouth was gaping open. Lily hadn't changed a bit, but it seemed like she was an entirely new person. Then again, this was very much more in line with Lily's wild side. She had never been the quiet and tame girl. This afternoon's problem was caused by her trying to fight this side of herself...

And now it looked like her own nature had won. "Grab my hair..." she whispered as she bent over his cock. The sight of his fist grabbing her hair and guiding her head opened the blood flow to the maximum. He moaned as she took him deep inside her mouth and began sucking him off.

After the shock of her reaction in the stall, Dustin had decided that if any other such accident occurred, he would pull out and run the fuck away. Now, seeing and hearing his sister devouring his cock like a succubus, her eyes looking straight into his, he knew that he would be powerless to resist. "So brother..." she said, taking a brief pause. "Do you like me like this?" She was looking at him, his cock as deep as it would go into her mouth. He nodded as pleasure flared.

Gods she was good! She was heavenly! Soon he found himself arching up against her gifted mouth. "Did Emily take you into her mouth like this?" He nodded again, unable to talk. "Was she better than I am?" This time he shook his head. He had not even believed that a blowjob could feel this good. For a few minutes Lily just focused on pleasing him and it worked marvellously.

Soon she paused again, as if to arouse him and give his cock a break at the same time. It was a mind-bending combination. "Earlier today, even if for just a few seconds, did my pussy feel like Emily's?" He nodded and groaned. A minute later she asked him "Have you ever dreamed of fucking the both us before this week?"

"Fuck yes!" he gasped, making his sister laugh.

"What about Erica?" she asked. And then, as if surprising herself with the question, she added "And mom?"

Dustin nodded, laughing at the irony Lily couldn't catch. Lily grabbed the base of his cock and squeezed it pretty hard, all the while continuing to work her magic. Her lips, tongue, inner cheeks and even the back of her throat... Such a perfect storm of feelings! "Ever had anal sex, dear big brother?" He froze at her question but his eyes opened wide. "Ooooh... Never?" she cooed. Dustin remained silent, letting her erroneously believe that he hadn't. She continued nonetheless "But you'd like to? Right?" he nodded. "Well then. I know how to make you accept my apology. Not tonight though... as I scream a lot when I get a cock or a dildo up my ass. But soon. I promise."

Dustin wondered why he was not already filling his sister's throat with his sperm. He guessed that her chokehold on his cock had something to do with it. In any case, he thanked her amazing skill. When she suddenly released the base of his cock, he felt a surge of pleasure unlike anything he had ever felt before. He had no idea where Lily had developed such skill, but she was clearly more experienced than her twin sister.

"My turn!" she suddenly said.

Lily then stood up and pushed Dustin on his back on the bed. Any notion that he would eat her pussy with her on her back with her legs opened vanished in seconds. Instead, Lily climbed over him and pretty much sat on his face. He wrapped his hands around her slender thighs and she bent forwards slightly and grabbed his head with her hands. And then she pulled his head up against her pussy.

Dustin had never been dominated like this in bed. But as he began eating her pussy, the taste strikingly reminiscent of her twin, he realized that he liked that. Even if left completely unattended, his cock was still twitching against his belly. He opened his mouth as wide as he could and simply went with her movements, her preferences.

She guided him with a few words as they stared into each other's eyes. It was a wonderful sight as he was seeing her round breasts from below and her beautiful face just above. But the long look they shared as brother ate his sister's pussy was almost as wonderful as the act itself. Almost. Dustin knew his sister was in complete control and, once again, couldn't help comparing her with Emily. They were physically almost identical and even psychologically as well. But in bed, they couldn't have been more different!

Dustin drank deep from his sister's pussy, glad of the break this position was giving to his cock. He wanted to say a few words, but she just kept grinding against him and he simply went with it. Fire in her eyes as she stared at him, Lily whispered "You're going to make me cum, big brother!" She shook her head violently, making her hair whip around. "How do you like that? Having your sister's pussy ready to explode into your mouth?"

And then she arched herself upwards, pushing her breasts out as he felt her trembling. She never released his head and he just kept pushing his tongue against her. After a few spasms, Lily pulled away and was giggling uncontrollably. "That was amazing!" she moaned as she sat on the bed next to him. Still breathing very quickly, she looked at his turgid cock and grinned. "Oh yes, now to take care of you!" she said, grinning like a fox. "Open your legs," she said.

Dustin didn't know what she had in mind, but just followed along happily. Lily lay herself completely above him, her thighs closed between his opened ones. Lifting herself with one arm, she guided her other hand between their bodies. She pushed his cock downward until its tip slipped between her thighs. Those thighs, as well as her pussy, were by now drenched with her juices and so everything slipped easily.

For a moment Dustin thought that his sister would try to slip his cock inside her despite the strange angles, but she had something else in mind. Lily placed one of her ankles over the other and lowered herself upon him. Instead of penetrating her pussy, Dustin's cock slipped deeper between her thighs and pussy until it emerged on the other side. And then Lily rose again. She was fucking him with her thighs!

This was something new for him and he soon realized that thigh fucking was way underrated. He had often tried to make an ordered list of what he liked best. Pussy, mouth and tits had long been his preference. But yesterday his mom's tits had made him rethink it, and a few minutes ago Lily's blowjob had prompted him to think again. And now this! This heavenly move his sister was gracing him with! Christ!

He didn't know if it was the position or if Lily's small but firm thighs, but the pleasure was incredible. And very different than a pussy, blowjob or titjob. Her creamy thighs on two sides and her dripping wet pussy lips on the other... Once again the Bermuda triangle was a source of pleasure for him. His hands were now on his sister's perfect ass as it rose and fell, and as his mind began to drift into a barely conscious haze of pleasure.

At one point, Dustin didn't know just how long they had remained in this position, he startled when Lily said "What's next, mister?"

"A thousand years of this!" he croaked.

"Hmmm. Glad to learn you like this. But I want that cock of yours inside my pussy... Your choice."

"Reverse cowgirl." he blurted out.

"Ooooh. Wanna look at my ass, right?"

"Christ, yes!"

"And what about my asshole?" she added as she squeezed her thighs harder together.

"You little succubus!" he breathed.

"Soon my dear, soon."

After that she kissed him on the lips and lifted herself away from him. Standing above him, letting him enjoy her immense beauty, Lily then slowly turned around. Staring at her ass as she lowered herself slowly above his cock, Dustin asked "When we'll... When you'll let me fuck your ass, will I be allowed to... to..."

"Kiss it?" she asked in a sultry voice. "Of course... Anything you want."

This was unbelievably wonderful! But now Lily was squatting over his cock, holding it upwards against her lips. "Ready for this big brother? Ready for your sister's pussy around your shaft?" He just moaned as she lowered herself completely. And rode him. Hard. Dustin grabbed a second pillow and just lay there, staring at the amazing ass swallowing his cock with ease.

For a long moment he didn't even touch her at all, letting her do all the work. But soon the temptation became too great and he grabbed her two cheeks with his wide opened hands. "Oh the perfection!" he thought. Lily lowered her knees on the bed, changing the angle. Shen then placed one hand on her ass and then, to his delight, touched her asshole with a fingertip. "Looking at this, brother?"

"Christ! You're a fucking wet dream coming alive!" he said, briefly remembering his accidental anal with Niemira.

Lily laughed before pulling her hand away and riding him faster. For the next few minutes Dustin watched in awe as her perfect little ass pummelled him into the bed. Her small waist, long golden back and thick black tresses flying everywhere, Lily was joy made flesh. Between two panting breaths, Dustin said "Turn around..." When she did, he asked her to put her feet on either side of his head.

It was now Lily's turn to be puzzled and obedient, but she did it anyway. Before she could do anything about it Dustin sat up and grabbed her ass. Pulling her up against him, knowing that she was flexible enough, he stood up with her in his arms. A few steps later he pressed her against the outside wall of his room and remained there for a moment. "It's my turn to pound into you, my dear sister."

She was laughing, her mouth opened by pleasure, as he began fucking her. Her arms were around his neck as she carried part of her weight. The position opened her pussy like none other before and Dustin felt his cock going even deeper than in the reverse cowgirl. Much deeper. "Fuck!" she cried. "You're longer than I thought! Damn!" she moaned, biting her lip.

Dustin didn't reply. By now he was just a well-oiled machine pistoning in and out of her relentlessly. It felt ridiculously wonderful. Even if he had spent the last week fucking different women with different sexual styles and intensities, this crazy sex with Lily was something else! They were both covered in sweat by now, shaking with pleasure.

Lily gasped when he pulled out and let her legs fall back to the floor. She stood in front of him, confused for a moment until he turned her around and grabbed her arms. Doing what he had seen in a porn movie a few months ago, Dustin grabbed her arms and pulled them behind her back. He then pulled her shoulder back and crossed his own arms behind her until he managed to grab both her arms.

Lily was now arched backwards and completely locked in place. He pushed her legs together before moving his own on the outside. After a few moments of trial and error he finally felt his cock slipping in her pussy and he arched himself into her. By now Lily's head was resting backwards against his shoulder as he began fucking her. A second later he pushed her body against the wall, utterly trapping her there.

When he had first seen that position on the clip, Dustin would have been ready to swear that he would never find a girl daring enough to let him do it. And now he had. Instead of complaining, Lily was clearly enjoying this. She was groaning, her guttural and animalistic grunts of pleasure going straight into his ear. "Fuck! Fuck! Fuck!" she kept repeating between her groans.

Dustin could feel her round ass being smashed by his strokes and soon realized that Lily was so far gone that he had to support her weight. Soon enough she climaxed again as her knees gave way completely. Dustin was grinning as her climax triggered his. He was breathing like a damned steam locomotive but as his climax peaked he was afraid he'd be unable to contain his scream.

Luckily for him he finally managed, but never in his life had he felt such a powerful climax. He was filling his sister's pussy with his cum and soon enough he felt his balls slapping into the overflow. In his arms, Lily alternated between complete decompensation and rigid breathing-stopping pleasure. He gently released her and they both reached the bed to collapse there. A minute later they both began to laugh. "Looks like we both had something to get out of our systems!" Lily said. As they snuggled closer together and sleep was calling them both, she added "We're not going to be disturbed. Emily was warned that if I did't come back, she would sleep in Erica's room."

"Hmmm. So you knew this might happen?" Dustin asked.

"I think you may have figured me out, by now. I so dearly wanted to and was afraid of it at the same time. Afraid of me I think." After a pause, she said "Are you afraid of me? Of this intensity?"

"Afraid?" Dustin asked, turning to kiss her lips. "Oh no. I think I've just become addicted to it."

She kissed him back and settled in even closer to him as they both fell asleep.

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P.S. I have many more ideas for such rather short and lighthearted stories. Do you want more of this kind of playful accidental penetrations stories? If so, let me know in the comments. If you also have ideas for accidental penetrations scenarios, let me know by sending me an email! Thanks!