I was already hard before we even boarded. My sister Lena and I had the two seats in the back row, the ones with extra legroom and a little curtain that the flight attendants rarely bothered with on red-eyes. She was twenty-two, I was twenty-four, and we’d been fucking in secret for eight months. This trip was supposed to be normal, just visiting our parents, but the second she showed up at the gate in that short black skirt and tight tank top with no bra, I knew we weren’t making it to the other side of the country without getting dirty.
We settled in fast. The cabin lights dimmed early. Most passengers were already asleep or plugged into headphones. Lena leaned over, her breath hot on my ear. “I’m not wearing panties. Thought you should know.” My cock twitched against my jeans. I slid my hand under her skirt right there, fingers finding her smooth, wet pussy lips. She was dripping already. I pushed two fingers inside her and she bit her lip to stay quiet, hips rocking just enough to fuck herself on my hand.
The plane hit a little turbulence and the seatbelt sign dinged on, but nobody was checking the back. Lena reached over, unzipped me, and pulled my dick out. She stroked it slow and tight, thumb rubbing over the head, spreading the pre-cum. “I want you to fuck me on this plane,” she whispered. “Right here. Like the filthy brother-sister porn we watch together.”
I didn’t need more invitation. I pulled my fingers out of her soaked cunt, licked them clean, then guided her onto my lap. She straddled me facing forward, skirt bunched up around her waist. The armrests gave us a little cover, but anyone walking by would see if they looked. That only made my cock throb harder. She reached down, lined me up, and sank onto me in one smooth motion. Her tight pussy swallowed every inch. We both groaned, low and rough.
She started riding me slow, grinding her clit against the base of my dick with every roll of her hips. I grabbed her ass under the skirt, spreading her cheeks, helping her fuck me deeper. The plane engine was loud enough to cover the wet sounds of her pussy sliding up and down my shaft. Every few strokes she’d clench around me and whisper, “God, your cock feels so good inside your sister.” That dirty talk always pushed me close to the edge.
I reached around and rubbed her swollen clit in tight circles. Lena’s breathing got ragged fast. She leaned back against my chest, legs spread wide over mine, letting me finger her while she bounced on my dick. “Don’t stop,” she hissed. “Make your sister come on this plane.” Her pussy started pulsing, getting even wetter. I felt her cum hard, thighs shaking, a little gush soaking my balls. She bit down on her own arm to keep from moaning loud enough for the whole cabin to hear.
I wasn’t done. I lifted her off me, bent her forward over the empty seat next to us, and slammed back inside from behind. The new angle let me pound her deep. Her ass slapped against my hips with every thrust. I reached under and grabbed her tits, pinching her nipples hard the way she likes. “You’re such a slut for your brother’s cock,” I growled in her ear. “Letting me fuck you where anyone could see.”
She pushed back against me, meeting every stroke. “Harder. Use me.” I gave it to her, fucking her fast and rough, the seat creaking just a little under us. My balls slapped against her clit. She came again, pussy clamping down so tight I almost lost it. I pulled out at the last second, stroked my cock twice, and shot thick ropes across her ass and lower back. Some landed on the seat. We didn’t care.
Lena reached back, scooped up a bit of my cum with her fingers, and licked them clean while looking over her shoulder at me. “Next time we’re doing this in the bathroom,” she said, voice still husky. “I want to swallow every drop while the plane shakes.”
We cleaned up with the tiny napkins from the seat pocket, straightened our clothes, and settled back like nothing happened. But the smell of sex hung in the air between us, and Lena kept her hand on my thigh for the rest of the flight, occasionally giving my still-sensitive cock a squeeze through my jeans. By the time we landed we were already planning the next trip.
