Just a warning before you start, I tend to focus on one main branch of a story, which is why I'm counting on you guys to help me out. If you get to a point where you don't like where I'm taking it, why not write a chapter for it? (Or you could just comment saying where you'd like it to go.) Anyways, enjoy!

When it all started, my sister was known for two things: acting and soccer. Okay, and teasing anybody who found her attractive (which, of course, includes me), so three things. Back then, it was a right pain in the ass – having to conceal your semi because your adopted sister gave you one of her looks isn’t exactly something to be proud of. Nowadays I don’t really mind - honestly I've kind of gotten used to it. Sure, she sometimes goes a little further than teasing with some guys, and indeed girls, but she still makes time for me. Eventually.

“Can you stop staring at me?” Emily asked, holding on to the side of the pool and glaring at me.

“You’re the only one in the pool, I’m just doing my job,” I replied indignantly from my lifeguard’s chair.

She rolled her eyes and went back to swimming. I kept watching, but tried to focus on whether she was still swimming, rather than how hot she looked while swimming.

Just as I managed to will my erection to sleep, she started swimming faster, throwing in tumble-turns at each end. Then I heard a loud thud.

“Oh, shit,” I said as her body went limp in the water. I leapt out of my chair and hit the pool alarm, then dived into the pool and started swimming towards her.

With the alarm ringing in my ears, I pulled Emily out of the water and laid her on her back, then checked her breathing as I tried to keep my panic under control. “Come on,” I whispered, counting to ten in my head. Nothing.

I put my mouth to hers and breathed out, and her chest barely moved. Automatically, I took hold of the swimsuit and ripped down the center to free her breasts, and the tearing of fabric temporarily drowned out the alarm. Like clockwork, I gave four more rescue breaths, then positioned the heels of my hands on her sternum and started pumping. After a couple of pumps, Emily coughed, and water dribbled out of her mouth.

Rolling onto her side, she coughed desperately and gasped. “Shit,” she coughed as she grabbed her head.

“You alright?” I asked.

She wretched without warning, and I scrambled away. A small trickle of vomit splashed onto the floor. “Oh, God, my head.”

As Emily moaned in pain, footsteps echoed around the pool, and the school receptionist knelt down next to her. “What happened, Liam?”

“She hit her head in a tumble-turn,” I said. “I got her out, and …”

I trailed off as Emily started looking around, and noticed her torn swimsuit and exposed tits. “What the fuck?” she yelled, covering her chest up. “Did you do this?” she glared at me.

Reluctantly, I nodded. “It was stopping you breathing.”

“Fuck.”

That was a Friday – our parents were always out on a Friday night, so I had taken up the lifeguarding shift after school at the school pool, and Emily would swim. That day, she was quiet all the way to the fast-food place on the walk home.

“What you getting?”

“Usual.”

I shrugged. “Two chicken burgers, please,” I ordered, making to hand over some cash.

“I’ll pay,” Emily said as she beat me to giving the money to the man on the counter.

“Suits me.”

“Well, you did save my life – I should probably buy you dinner,” she smirked.

“Yeah, but I wrecked your swimsuit.”

“So buy me a new swimsuit.”

I nodded. “Fair enough.”

We waited in silence until our burgers were ready, then made our way to the usual bench and tucked in.

“Hey, um, thanks,” Emily said through a mouthful of chicken. “You know, for saving me. Don’t think I've said that yet.”

“Well, it gave me the opportunity to see your tits,” I smirked.

“Oi,” she laughed, punching me on the shoulder.

Looking into her beautiful brown eyes, a sudden, familiar impulse came over me, but for once I wasn’t quick enough to suppress it: I kissed her. Like, full-on kissed her.

As soon as our lips touched, I froze. A second or two passed, which to me felt more like a year. Then, slowly, she kissed me back. At that point, my heartbeat was as loud as a drum in my ears, and I didn’t care that both our tongues tasted like processed chicken, I didn’t care that my erection was probably visible through my pants, and I definitely didn’t care that it was my sister that I was kissing.

Now would probably be a good time to explain the family situation: our ‘parents’ couldn’t have children, so they decided to adopt. For some reason, they thought just adopting one child would be too easy, so they adopted two: Emily and I. We were adopted at pretty much the same time – I don’t really remember, I was only 3 – and … yeah. We became brother and sister, which must have been a little weird for outsiders, because I’m white and she’s half-Asian, but we've always seen it as normal. Anyway, back to the smut.

“Fuck, I knew you had a crush on me, but …” Emily said sheepishly, wiping her lips with the back of her hand.

“Sorry,” I tried to look remorseful, but the shit-eating grin gave the game away.

Seeing the look on my face, she laughed and pressed her lips to mine again. Once again, the extent of my senses shrank down to the contact between our mouths and the electric tingle on the back of my neck. Then I jumped, feeling her hand on my shoulder as Emily pinned me against the bench and straddled my lap with her chest pressing up against mine; subconsciously, my hands strayed down to her hips, and I prayed that she wouldn’t notice my erection beneath her body.

“Hey, Em, we’re in public,” I whispered. “You sure your head’s alright?”

“Shut up,” she grinned, wrapping her arms around my head and pulling me close.

Seconds blended into minutes as we explored each other’s mouths, and my hands crept under her school skirt. I felt Emily shiver as I began gently caressing her legs, and she let out a small laugh. “I thought you didn’t want to do this in public.”

“Do what?” I smirked, brushing her inner thigh.

She gasped in arousal, and squirmed at my touch. “Shit,” she whispered.

Ignoring her curse, I kissed her desperately, unable to get enough of her, and she writhed on my lap; I felt her panties grind against my crotch, and I moaned softly.

“Oops,” she smirked, a mischievous twinkle in her eyes.

A sudden voice interrupted us. “Jeez, get a room,” said a woman in her late twenties, who was holding the leads of two dogs.

“Sorry,” Emily blushed as she stood up and brushed her skirt down. The woman kept walking after giving me a disgusted look. As soon as she was out of earshot, Emily grinned at me. “You’ve got a boner.”

I glanced down and quickly crossed my legs, tucking my erection between them. She laughed and sat back down on the bench. Snuggling up next to me, she resumed eating her burger, resting her head on my shoulder. I looked around for mine, and saw it in a small, muddy puddle behind the bench. “Goddammit.”

“What?”

“My burger.”

Emily laughed, and handed me hers. “I’m not giving you all of it – to share.”

“Thanks.” I put my arm around her, pulling her close.