Alexia's POV The car hummed along the highway, leaving the worst of the potholed backroads behind us. My heart was still pounding so hard I could feel it in my throat. Damien's cock was still buried deep inside me, thick and pulsing, his cum slowly leaking out around where we were joined. I could feel the warm, sticky mess dripping down my thighs, soaking his shorts even more. Guilt hit me like a truck. What the hell did we just do? He was my stepbrother. Twenty years old, tattooed, cocky as hell... and I had just let him fuck me raw in the backseat while our parents sat less than two feet away. My pussy clenched around him at the memory, and I hated how good it felt. "Fuck... Alexia," Damien whispered, voice rough with the same conflict I felt. His hands gripped my hips tighter for a second, then he started to lift me off him. "We can't... we shouldn't have-" The moment his cock slipped out of me with a wet, obscene sound, a gush of our combined juices spilled down my folds. I whimpered softly, my walls fluttering around nothing. I was soaked. Sloppy. Dripping. The insides of my thighs were shiny with it. Damien froze. I felt his cock twitch hard against my ass as he stared down at the mess. "Fuck... you're still this wet?" His voice dropped even lower, almost angry at how turned on he was getting again. "Look at you. My cum's leaking everywhere." "I-I didn't mean to," I whispered, trying to pull my tiny black dress down. It was hopeless. The fabric was already ruined, clinging to my skin. My legs were trembling. I was eighteen, supposed to be the responsible one, and yet here I was-pussy throbbing, aching for more even as shame burned my cheeks. For a few minutes, he tried. He really did. Damien shifted me on his lap so I was sitting more sideways, his arms around my waist like a normal big brother steadying his sister on a long drive. He even grabbed his phone and pretended to scroll. But every time the car hit a slight bump, my bare, dripping pussy dragged along the hard ridge of his cock through his soaked shorts. The guilt was there, but my body didn't care. I was ruined. Too wet. Too sensitive. Every little movement made my swollen clit throb. The road finally smoothed out as we hit the main highway heading toward Grandma's place upstate from New York. No more potholes. Just clean, steady speed. For a moment, I thought we could behave. Damien's breathing grew heavier behind me. His hands slid under my dress again, one on my stomach, the other cupping my soaked mound. "Alexia... you're fucking flooding," he groaned quietly. "I can feel how sloppy you are. This pussy doesn't want to stop." "I'm trying," I lied, biting my lip hard. But my hips rolled back against him anyway. His cock was rock hard again, tenting his shorts obscenely. He tried one last time to be good. "We should stop now. No more. This is insane." But then he rubbed two fingers along my slit, spreading the mess, and I moaned too loudly. He cursed under his breath and pulled his cock out again-this time not to stop, but to line himself up. "Damien..." I breathed. "Shut up and take it," he growled softly, and thrust up hard. A serious, deep stab. I nearly screamed. My walls stretched around his thick length again, the wet squelching sounds louder now on the smoother road. I clapped a hand over my mouth, eyes rolling back as he started fucking me with purpose-long, powerful strokes that made my tits bounce under the thin dress. He was so deep. Every thrust hit that spot that made my toes curl. My juices were everywhere, coating his balls, soaking the seat beneath us. The guilt only made it hotter. Suddenly, he lifted me and bent me forward. I had to brace my hands on the back of Dad's seat to keep from falling. My face was inches from the headrest. "You okay back there, sweetie?" Dad asked, glancing in the rearview mirror. My voice came out shaky. "Y-yeah, Dad. Just... stretching my legs a little. Cramp again." Damien didn't even slow down. He gripped my hips and started pounding me in this new angle-brutal, wet slaps echoing quietly in the confined space. Plap. Plap. Plap. My sloppy pussy took every inch, creaming around his cock. Stepmom turned slightly. "Should we stop for a bit? Let you walk it off?" "No!" both Damien and I shouted at the same time. I felt him smirk against my shoulder. "We're good, Mom. Really." That was it. The last thread of restraint snapped. Damien pulled me fully into doggy style on the backseat, my knees sinking into the cushion as he railed me. Hard. Merciless. His hips snapped forward, driving his cock into my dripping cunt over and over. My face pressed against the back of Dad's seat with every thrust, muffling my whimpers. I was losing my mind. Pleasure crashed through me in waves. One orgasm. Then another. My eyes fluttered. The world started going blurry from how intense it was. I almost passed out, body shaking violently as a third climax ripped through me. Damien yanked me back onto his lap just in time, impaling me reverse cowgirl. "Ride me, baby. Come on. Give me more." I did. I rode him like I was possessed-bouncing on his thick cock, my ass slapping against his thighs. The dress was bunched around my waist. If anyone looked through the windows... we are gone.... Dad cracked the window open for fresh air. Cool highway breeze hit my exposed skin. Other cars were passing us. They could probably see something if they looked closely, but I didn't care anymore. I was too far gone. We fucked like animals. Damien's hands were everywhere-pinching my nipples, rubbing my clit, gripping my throat lightly to keep me quiet. I came again. And again. By the sixth orgasm I was a sobbing, trembling mess, tears of overwhelming pleasure leaking from my eyes. "Too much... Damien, I can't-" "You can," he panted, thrusting up to meet me. "You're already ruined, sis. Look at this sloppy fucking pussy. Can't stop creaming on your stepbrother's dick." The car slowed. Dad pulled into a rest stop. "Quick break for food. You two staying in the car?" "Yeah," Damien said immediately, voice strained as my walls fluttered around him again. "We're... comfortable." Mom smiled sweetly. "I'll bring you kids some shawarma and ice cream. Don't want you stepping out if you're not feeling well, Alexia." As soon as they walked away, Damien flipped me around to face him and fucked me even harder, his mouth on my neck, sucking marks I'd have to hide later. "You're mine now," he whispered against my skin. "Too wet. Too full of my cum. No going back." I came one final time as Mom and Dad headed back toward the car, my face buried in Damien's shoulder to silence the scream. We were sloppy. We were ruined. And the road trip was only halfway done.

Alexia's POV My body was still trembling from the last orgasm when Damien's cock twitched inside my sloppy, cum-filled pussy again. The car was moving again after the rest stop, the smooth highway giving way to smaller roads as we got closer to Grandma's place upstate. Dad was focused on driving, Mom humming along to the radio. But in the backseat, everything was filthy. Damien groaned low in my ear, rolling his hips slowly, stirring his cock deep inside my creamy cunt like he couldn't stop himself. "Fuck... if your pussy is this tight and greedy," he whispered roughly, "I wonder how your asshole will feel." The words sent a dirty thrill through me. I ground back against him, my juices and his cum making everything slick and messy between us. "You wanna give it a try?" I moaned softly, my voice barely a breath. He chuckled darkly, thrusting shallowly. "You're such a little slut, Alexia." "What will you use on my asshole?" I replied, trying to sound bitchy even as my walls clenched around him. Damien reached for the cup holder beside him - the ice cream Mom had bought us at the rest stop. Vanilla. Still cold and melty. "This. I'm gonna fill your tight little asshole with my ice cream, sis. Get it all wet and creamy for my cock." My eyes widened, but my pussy fluttered at the filthy idea. Before I could protest, he lifted me slightly, his cock slipping out with a wet pop. Cool air hit my dripping folds. He scooped a generous amount of the melting ice cream onto his fingers and smeared it between my ass cheeks, right over my puckered hole. I gasped sharply as the cold cream touched my hot skin. "Damien-" "Shhh." He rubbed it in circles, pushing some inside with his fingertip. The contrast made me moan louder than I meant to. He added more, feeding the creamy dessert into my ass until it was sloppy and leaking. Then he leaned me forward, spread my cheeks, and dragged his tongue over my cream-covered asshole. "Oh my God..." I whimpered, gripping the back of Dad's seat. His tongue licked and probed, lapping up the melting ice cream while pushing more of it deeper. The wet, obscene sounds of him eating my ass filled the backseat. He licked for what felt like forever, sucking and tonguing my tight ring until I was shaking, the mix of cold cream and his hot mouth driving me insane. Dad's voice cut through. "Alexia? What's going on back there? You sound like you're in pain." "C-cramps, Dad," I stammered, voice shaky. "Just... leg cramps again." He sighed heavily. "I told you to get out and stretch at the rest stop. You never listen." "Sorry," I breathed, right as Damien pushed two thick fingers into my cream-slick asshole, stretching me. I pressed my face against the backseat, breathing hard. Damien didn't stop. He fingered my ass slowly, scissoring and twisting while his other hand played with my dripping pussy. The ice cream had melted completely, making everything slippery and messy. My thighs were sticky. My dress was ruined. When he finally pulled his fingers out, I felt empty and aching. "Sit on it, baby," he growled, lining up the thick head of his cock against my cream-coated asshole. "Slow at first." I lowered myself carefully, whimpering as the wide head pushed against my tight ring. It burned. It stretched. Inch by inch, I sank down, my ass swallowing his cock. "It's so big... fuck..." Halfway down, the car hit a sudden bump. The jolt forced me the rest of the way, impaling my asshole fully on Damien's thick cock in one brutal motion. "Aaahhh!" I groaned way too loudly, my vision blurring from the overwhelming fullness. The pleasure-pain mix nearly made me pass out. My stepbrother was buried balls-deep in my creamy ass. Dad hit the brakes, slowing the car. "What the hell was that? Alexia!" My Stepmom turned, concern all over her face. "Sweetie, are you okay? We can pull over-" Traffic suddenly built up ahead - we were entering a small construction zone, cars forming a slow line. Dad cursed under his breath but stayed in the queue. Before I could answer, Damien yanked me back against his chest and shoved four fingers into my mouth, gagging me. "Quiet," he hissed. I moaned around his thick fingers, drooling as he started thrusting up into my ass - slow, deep, devastating strokes. My tight ring gripped him like a vice. The ice cream and my natural wetness made it obscenely slick. A car pulled up beside us in the next lane. The driver - some guy in his thirties - glanced over. His eyes widened when he saw my flushed face, Damien's hand stuffed in my mouth, and the way my body was bouncing subtly on his lap. He stared for a long second before our car inched forward and he sped off. We didn't care. Let them watch. This forbidden thing between us was too strong now. "It's all your fault," Damien grunted, pinching my nipples hard through my dress. I whimpered loudly into his fingers, the sound muffled but still filthy. "You were too wet... too fucking sloppy. Now I'm ruining this tight asshole." He fucked me harder, hips snapping up. My creamy ass took every inch, the wet sounds growing louder despite the radio. I lost count of how many times I came - or maybe I was just in one long, shattering orgasm. My asshole clenched and fluttered around him, milking his cock. Damien pinched my nipples again, twisting them as he railed me. My moans vibrated around his fingers. Tears of overwhelming pleasure ran down my cheeks. Grandma's house was finally coming up - we could see the familiar turn-off in the distance. The thought of our parents catching us any second sent Damien over the edge. "Fuck... gonna fill this creamy ass, sis," he growled, voice breaking. He slammed up deep one last time and came hard, flooding my insides with thick, hot ropes of cum. Pulse after pulse, he pumped me full until it was leaking out around his cock, mixing with the melted ice cream. I shuddered through another climax, my body completely ruined. We stayed locked together, breathing hard, as Dad turned into Grandma's driveway. Damien slowly pulled his fingers from my mouth and helped me adjust my dress. Cum and cream dripped down my thighs. We prepared ourselves for whatever consequences, if anyone find out. But deep down, I knew this was only the beginning. To be continued...