He shoved me face down on the bed, his thick cock already leaking against my ass. "You want it raw like always, little bro?" he growled, spitting on my hole and rubbing the head of his dick up and down my crack. I pushed back, hungry for it, my own dick throbbing against the sheets.
Our dog, Rex, sat in the corner watching, tail thumping. My brother noticed and laughed low. "Looks like Rex wants in on the action too." He reached over, patted the dog's head, then guided Rex closer so the animal's snout could sniff at my balls and hole. The wet nose pressed in, tongue lapping hot and rough over my taint. I moaned, the sensation filthy and intense.
My brother lined up and slammed into me in one hard thrust. "Fuck, you're tight," he grunted, pounding my ass with deep, dirty strokes. Each slam made my hole grip him, the slap of skin loud in the room. Rex kept licking, his tongue dragging over where my brother's cock stretched me open, mixing spit and pre-cum.
I reached back and spread my cheeks wider. "Deeper, bro. Fuck me harder." He did, grabbing my hips and railing me, balls slapping my taint while the dog lapped at everything. The mix of my brother's thick cock owning my hole and the dog's eager tongue made me shake.
He pulled out, flipped me onto my back, and shoved back in. "Look at you, taking it like a slut for your own brother." His hand wrapped around my dick, stroking fast in time with his thrusts. Rex moved up, licking my chest, then my brother's fingers, then back down to my balls.
My brother pulled out again, this time letting Rex's tongue take over fully on my hole, the dog's rough licks pushing inside as much as they could. I jerked myself while he watched, then he fed his cock back into me. "Gonna breed you while the dog cleans us up."
He fucked me faster, sweat dripping, the bed creaking. When he came, he buried deep, flooding my guts with hot cum. He stayed inside until he softened, then pulled out so Rex could lick the cum leaking from my stretched hole. I came hard from the sight and feel, shooting across my stomach while my brother watched and grinned.
We lay there catching our breath, the dog still nosing around our spent bodies. "Next time we switch," he said, already getting hard again against my thigh. I nodded, knowing this filthy secret between us and the dog was far from over.
