We were two hours into the drive home when my sister Emma finally stopped pretending. She kicked off her sneakers, propped her bare feet on the dashboard, and let her skirt ride up her thighs until I could see the edge of her white panties.
"Fuck, it's hot in here," she said, voice low and lazy. "You mind if I take these off?"
I kept my eyes on the road but my cock was already thickening in my jeans. "Do whatever you want.
It's your car too."
She laughed, that dirty little laugh she only used when no one else was around. She hooked her thumbs in the waistband and slid the panties down her legs, then tossed them onto my lap. They were warm and damp.
"Smell that?" she asked. "That's what happens when I sit next to you for too long."
I grabbed the panties with one hand and pressed them to my face while I drove. Her scent was thick and sweet, pure pussy. My dick strained against my zipper.
"Pull over," she said. "There's that old rest stop up ahead. No one's ever there."
I took the exit without arguing. The parking lot was empty, just cracked asphalt and a single broken light. I killed the engine and turned to her.
Emma was already climbing into the backseat. She pulled her tank top over her head, tits bouncing free, nipples hard. "Get back here and fuck me before I change my mind."
I climbed after her, knees hitting the seat, already unzipping. My cock sprang out, thick and leaking. She spread her legs wide on the worn upholstery, skirt bunched at her waist, shaved cunt glistening.
"Look how wet I am for my brother," she said, reaching down to spread her lips. "Been thinking about this cock all week."
I didn't waste time. I shoved two fingers straight into her. She was soaked, tight and hot, clenching around me immediately. She moaned and rocked her hips, fucking my hand.
"Harder," she demanded. "Finger-fuck your little sister's cunt."
I pumped her fast, thumb grinding her clit, until she was dripping down my wrist. Then I pulled my fingers out and replaced them with my cock in one rough thrust. She cried out, back arching off the seat as I buried myself balls-deep.
"Fuck yes," she hissed. "Give it to me. Fill that pussy up."
The car rocked with every slam of my hips. Her tits bounced, sweat already slicking her skin. I grabbed her throat lightly and she moaned louder, legs locking around my waist.
"Harder, big brother. Pound me like you mean it."
I fucked her like an animal, the wet slap of skin on skin loud in the small space. Her pussy gripped me like a fist, creamy and hot. Every time I bottomed out she gasped and clawed at my back.
"Play with your clit," I ordered. "Make yourself come on my cock."
She reached down and rubbed fast circles while I railed her. Her moans turned into sharp little cries. "I'm gonna come. Don't stop. Fuck your sister. Fuck me, fuck me, fuck me—"
She came hard, cunt pulsing and squirting around my dick, thighs shaking. I kept pounding through it until she was whimpering, oversensitive, then I pulled out and flipped her onto her stomach.
"Ass up," I growled.
She pushed her knees under her, presenting her dripping hole and tight little asshole. I spat on her rim and pushed my thumb in while I slammed back into her pussy. She shoved her face into the seat and screamed into the fabric.
"Use both holes," she begged, voice muffled. "I want to feel dirty."
I worked her ass with my thumb while I fucked her cunt deep and steady. The car windows were fogged, the air thick with the smell of sex and sweat. I reached under her and pinched a nipple hard. She came again, smaller this time but longer, body trembling.
When I was close I pulled out and dragged her upright by her hair. "Suck it. Taste your cunt on your brother's cock."
Emma dropped to her knees on the floorboard and took me straight to the back of her throat. She gagged but didn't stop, eyes watering, spit running down her chin. I fucked her face in short thrusts until my balls tightened.
"Swallow it," I warned.
She moaned around my cock and I unloaded, thick ropes shooting down her throat. She swallowed every drop, then licked me clean, tongue swirling over the head until I twitched.
We stayed like that for a minute, breathing hard. Then she climbed back onto the seat and pulled me down with her, my softening cock resting against her thigh.
"Round two when we get home?" she asked, already stroking me again.
I kissed her hard, tasting myself on her tongue. "We're not making it home tonight. I'm fucking you in every position this backseat allows first."
She grinned against my mouth. "Good. I've got all night."
