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...
