Mark stood there in the dim bedroom, pants around his ankles, his cock already leaking while Tom stared at his ass like it was meat. "You said you wanted it," Tom muttered, voice low and rough. "First time gay anal, huh? Turn around and spread those cheeks so I can see what I'm about to fuck."
Mark did it, face hot, heart hammering. He bent over the edge of the bed and pulled his ass open with both hands. Tom stepped up close, spit in his palm, and rubbed it straight over Mark's tight hole. No teasing, just one thick finger pushing inside without warning. Mark grunted at the sudden stretch. "Fuck, that's tight," Tom said, working the finger deeper. "Virgin ass. Gonna take my time ruining it."
He added spit and a second finger, twisting them, scissoring Mark open.

Mark pushed back without thinking, hole clenching around the invasion. "More," he rasped. Tom laughed once, dirty and short, then pulled his fingers free and wiped the spit on Mark's balls. "Beg for the cock then. Tell me you want this dick in your guts."
Mark's voice came out shaky but clear. "Shove it in me. Fuck my ass." Tom lined up, the fat head of his cock pressing against the slick ring. He didn't ease in. One hard shove and the head popped past the muscle, stretching Mark wide open in one brutal inch. Mark hissed, the burn sharp and real, but his cock jerked and drooled onto the floor. Tom gripped his hips and kept pushing, forcing every thick inch inside until his balls slapped Mark's taint.
"Goddamn, this hole's choking my cock," Tom growled. He pulled back halfway and slammed in again, setting a steady, filthy rhythm. Each thrust punched the air out of Mark's lungs and made his rim burn and grip. Tom reached around, grabbed Mark's cock, and stroked it in time with the pounding. "You feel that? That's your first real fucking. Taking it like you were made for it."
Mark moaned and shoved back, meeting every thrust. The pain bled into something hotter, deeper, until all he wanted was more dick battering his prostate. Tom changed angles, nailing that spot on every stroke until Mark's legs shook. "Gonna cum already?" Tom taunted, fucking faster, skin slapping loud. "Shoot while I wreck this virgin ass."
Mark came with a broken shout, ropes of cum splattering the floor while his hole fluttered and squeezed around Tom's cock. Tom didn't stop. He fucked through the clenching, using the extra slick, driving in harder until his own orgasm hit. He buried himself to the root and unloaded, pumping thick cum deep inside Mark's stretched hole. When he finally pulled out, a messy string of it followed, dripping down Mark's thighs.
They stayed like that a minute, breathing hard. Tom ran two fingers through the mess leaking from Mark's hole and pushed it back in. "Not done yet," he said. "Round two, and this time I'm gonna make you beg louder." Mark just nodded, already pushing his ass back for more.