I came home late from the gym and found my older brother Mark sprawled on the couch in just his boxers, his thick cock already half-hard and poking out the leg hole. He didn't even try to hide it when I walked in. "Lock the door, little bro," he said, voice low and rough. "Mom and Dad are gone all weekend. Get over here."
I dropped my bag and crossed the room without a word. My own dick was straining against my shorts by the time I reached him. Mark grabbed my wrist and yanked me down, shoving my face straight into his crotch. The smell of sweat and precum hit me hard. "Suck it," he ordered. I pulled his boxers down and his fat cock sprang up, veined and leaking. I wrapped my lips around the head and sucked hard, tongue swirling over the slit to taste him.
Mark groaned and pushed my head down, forcing more of his shaft into my throat. "That's it, take your brother's cock. Been wanting this since we were kids." I gagged but kept going, bobbing fast and sloppy, spit running down his balls. He fucked my mouth in short thrusts, one hand gripping my hair tight.

My own cock throbbed untouched, leaking into my underwear.
After a few minutes he pulled me off and stood, stripping me naked in seconds. He spun me around and bent me over the arm of the couch, kicking my legs apart. "Gonna fuck this tight brother hole raw." I heard him spit on his fingers, then two thick digits shoved inside me, stretching and twisting. I pushed back, moaning like a whore. "More, Mark. Fuck me already."
He lined up and slammed in with one brutal thrust. His cock split me open, burning and perfect. He didn't wait, just started pounding, hips slapping against my ass with wet smacks. Every stroke went deep, hitting that spot that made my legs shake. "Fuck yeah, take it," he growled. "This ass is mine now." I reached back and spread my cheeks wider for him, begging for it harder.
Mark flipped me onto my back on the couch, hooked my legs over his shoulders, and drove back in. He leaned down and kissed me rough, tongues sliding as he fucked me like he hated me. Sweat dripped from his chest onto mine. He wrapped a hand around my leaking cock and jerked it in time with his thrusts. "Gonna fill you up, bro. Breed that hole."
I came first, shooting thick ropes across my stomach and chest while he kept hammering. My ass clamped down on him and he lost it, burying himself to the balls and unloading deep inside me. Pulse after pulse of hot cum flooded my guts. He stayed buried, grinding slow as he emptied every drop.
We didn't stop there. He pulled out, flipped me over again, and ate his own cum out of my hole, tongue pushing deep while I moaned into the cushions. Then he made me suck him hard again and fucked me on the floor, on the kitchen table, and finally in the shower with hot water pounding down on us. By morning we were both sore, covered in cum and bite marks, already planning the next time we'd lock the door and use each other like the filthy brothers we were.