On our sides as we were, my right hand stayed under her, fingers tangled up in her hair. But my left was free to explore, and did so as we kissed and she continued to stroke me. After running up and down her back and giving her butt a few squeezes, I found my way to her pussy. Liv was very wet, and as I teased around her labia she let out a soft moan into my mouth. I teased her for a while longer, making sure my fingers were covered in her wetness. I found her clit and started to play with it. Our lips separated when I did, and Liv fixed me with an almost pleading expression, her attention to my dick momentarily stopped. I teased her for a second or two more before slowly inserted a few fingers into her slit. She closed her eyes as I did, breathing hard. After a few seconds, her eyes opened again and she kissed me with renewed passion, while resuming her hand job. We let our hands work on each other for a while. I fingered her while she stroked my cock, while we kissed and lost our breath in the heat. At one point Liv’s hand went still again, and her lips fell away from mine. She let out a sudden moan, surprising me with its volume.
“Shhhh” I whispered. “The door is still open.” Her head moved hurriedly up and down to show she understood.
“Just don’t stop.” Liv spoke very softly, her voice wavering. I continued the exact motion I was using, and shortly after felt her shudder under me. Her orgasm was intense, and when it passed, she looked me in the eyes, said nothing, and kissed me again, her hand working up and down my shaft with restored vigor.
Usually this type of tender attention would not have been enough to get me to cum, or at least take a while, but I was so worked up. Added on to the fact that it was Liv gripping my cock, and it wasn’t very long before I felt myself getting close. I grunted and felt her stop briefly. Liv looked at me expectantly.
“Sorry,” I whispered. “I’m getting close.”
“Put it in me.” Liv spoke, her voice raw with arousal.
“I won’t last,” I warned.
“I’m on the pill. Just be quiet.” Her eyes flicked down, reminding me where we were. In spite of my policing of her, as my orgasm approached, I had completely forgotten our parents were directly below us. And our door was open. Something about restating that realization turned me on even more. I was about to fuck my sister, ten or so feet above our parents, and at any moment they were two or three ladder rungs away from watching it happen. I trembled a bit.
We shifted our positions. I pushed myself up and to the left, and Liv scooted slightly to the right, until she was under me. We kissed as we scrambled, and her hand stayed on my cock, holding it like a link between us, loath to let it go. I propped myself up around her, leaning down to kiss her as she leaned up to kiss me back. She gave my cock a few extra tugs. The air around us was heavy, as hot as we felt.
“You sure?” I managed to get out, between pecks.
“I’ve never wanted anything more,” Liv whispered. We were both panting, the sound of our breathing almost louder than our voices. “I want to feel you inside me.”
I propped myself up on one arm, and reached down, meaning to take over for the hand she still had on my rod. Liv stopped me.
“I want to.” She said, pulling my dick gently toward her. “Let me.”
I nodded and kissed her as she lined us up. My swollen head poked her pussy lips. Both of us stifled moans into the other’s mouth. She rubbed me up and down her slit, getting the head of my cock covered in her pussy juices. Then I felt her steady me at her opening, and pull gently. My turn to help, I thrusted forward, my hips adding the needed pressure. Liv was so wet, my cock slipped right through, and I entered her smoothly and slowly. Her hand released me as I went, coming to cup my face as our lips stayed locked together.
It was the hottest moment of my entire life, in every way imaginable. Liv’s cunt was warm and wet, gripping and flexing around my cock as I slid inside of her. I went slow, steadily pushing farther and farther into her, until I bottomed out, deep inside my sister. Liv gasped as I did, her head moving past mine as her arms wrapped around me, gripping me hard. We stayed like that for a moment, quiet, melding together in the sultry heat of that cabin loft. I could hardly believe this was happening. I was balls deep in Liv, in my sister, in the most beautiful girl I’d ever known. I stayed still for what felt like an eternity. All my instincts were telling me to start thrusting, but I delayed, savoring the moment of pure intimacy.
Eventually I started moving, slow at first, pulling almost my full length out, before inserting it all the way back in. Already I knew I’d told her the truth; I was not going to last. Liv felt too fucking good. I started thrusting faster, long and deep strokes inside of her. We took a break from kissing, and Liv watched me fuck her, gripping me tight with her eyes locked on mine. The bed rocked under us, and after an exceptionally hard thrust, creaked slightly. I froze on top of her, remembering again the compromising position we were in. It would not be a good idea to wake our parents up with the sounds of a rocking bed above them. Liv hid a smile, and I think she would have laughed if not for our aforementioned efforts to be quiet.
“Careful there big guy,” Liv purred. Then she wrapped her legs around me too, so that we were completely entwined. Pulling my head down with her hand, she tickled my ear with her tongue. “Fuck me quietly,” She whispered.
Fuck that was sexy. I started up again, more careful this time, holding myself back to simple hip thrusts, driving my cock in and out of her with minimal other movement. Her legs pressed against my back and ass. We were both slick with sweat, breathing so hard for a second I wondered if our parents would hear us anyways, the unmistakable sound of our heavy panting bleeding through the floorboards. Liv ran her hand through my hair, tangling and pulling it. She let out a sound, half sigh half moan, cutting it short for fear of being too loud. I was almost there. I felt her shudder under me, and knew she was as close as I was. I could feel the pressure welling up from deep in my groin, my cock pulsing inside of her as I got ready to blow. I could feel the last two days of frustration and blue balls coming to a climax. I could feel the strain as I teetered on the cusp of a monumental orgasm.
“Cum in me.” Liv gasped between heavy breaths. “Cum in me.”
That did it. I came.
Liv quivered under me as she came again herself, but any recognition of that was far from my mind as the pleasure of my own orgasm overtook me. I erupted deep into her, spurting my seed in an explosion of pleasure. I felt each individual surge of semen, bucking into Liv as I kept cuming, and cuming, and cuming. Recovering first, she held me close, pulling me into her, and keeping me there as I crested my orgasm’s climax. A few last twitches and my cock was finally spent. Coming down from my high, I collapsed, cock throbbing, still deep inside of my sister’s pussy. Liv cooed softly as I reached the end of my orgasm, her hand playing with my hair as I buried my face into the pillows behind her.
I stayed still for a while, hot and exhausted. Liv traced circles lightly across my back. She’d relaxed her legs, but we stayed intertwined. And I stayed inside of her. My underused cock stayed relatively hard and extremely sensitive. Once some of the afterglow faded, I dragged my head from the pillows, and pushed myself up far enough to again be face to face with Liv. She was flush, and her hair stuck wet from sweat to her forehead. Mine probably was too, I realized. I could feel the wetness, the mugginess of the room. We were a sweaty mess, and everything smelled of sex. I looked into her eyes, and Liv looked into mine. My baby sister spoke first.
“Woah…” was all she said.
“Yeah…” I took another deep breath.
“I could feel you shaking. You came a fuck ton.” Her voice was airy, a mix of awe and after orgasm bliss.
“I was really worked up.”
“I can feel it dripping already. It’s going to make a mess.”
“Do you want me to do something about it? I could get a towel.”
“And leave me? Don’t you dare.” She wrapped her legs around me again, keeping me trapped and buried deep inside her.
“Well, I don’t see any reason for mom or dad to come up here. And even if they do, who says the cum stains are ours?”
Liv giggled, then took on a mock serious tone. “Oh, that wet spot? On my sheets that I put on the bed? Don’t know what you’re talking about.”
“No idea where it came from.” I took on a similar voice. “Cum fairy maybe. Cum leprechaun.”
“Stop,” Liv said, hitting me in the chest. “You’re going to make me laugh.”
“So?”
“Yeah, and when my laugh wakes up our parents, and dad comes up to see what all the commotion is about, and sees you balls deep in your sister, cum leaking out of her pussy? What then?”
“I tell him we couldn’t sleep.”
“You’re an idiot,” Liv said, smiling anyway.
“I know.” I leaned down and kissed her again. She returned it wholeheartedly, still gripping me with her legs.
“As much as I want to stay like this forever,” I said when we parted. “My arms are tired, and it’s really fucking hot.”
“It is, isn’t it?” Liv said. “I suppose I can let you go… on one condition.”
“Which is?” I raised an eyebrow at her.
“You’ll go cool off with me.”
“But I was totally going to just fuck you and go to sleep,” I joked. “What, you want me to spend more time with you?”
“Fucker. Fine then, get out of me.” She untangled her legs and gave me a good push, and I fell off and to the side. My cock finally slipped out of her, and I could feel a lot of my cum coming with it.
“Fuck,” Liv said. It was hard to see anything in the dark, but I knew a lot of me would currently be spilling out of her. “Let’s hope they never feel a need to come up here.”