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Red, the imposter was venting when he came across pink jacking off in medbay. He slowly climbed out of the vent and wrapped his arms around Pink startling him.
"R-Red?? How did you get here?" asked Pink slowly turning around. Realization slowly set in when he saw the vent door open. "...You're the imposter?" He asked shocked. "Hah, caught me" Red replied. "Don't worry, I'm not here to kill you, I just noticed what you were doing and thought you might need a little help" Red says, gesturing towards Pinks hand which was currently on his penis.
"Oh...well I guess I wouldn't mind some help" Pink replied turning his head and blushing. Red pushed Pink against the wall and roughly kissed him, sliding his tongue inside Pinks mouth and dominating him. Pink softly moaned as Red fought with his tongue. Red slowly moved on from his mouth and started trailing kisses and sucking on Pink's neck leaving red marks.
"Aah, I need you~" Pink said desperate for the imposters cock and tired of waiting. "I need to prep you first" Red responded pulling Pinks and his pants down. Red took three fingers and put them in front of Pinks mouth. "Suck" Pink instantly started sucking on Red's fingers lubing them up as good as possible.
Red then took them out and rubbed a soft circle around Pink's ass and toyed with the ring of muscle. Pink moaned softly "Please~ I need it so bad" Hearing Pinks moan went directly to Red's cock making him harder and craving Pink even more. He slid one finger into Pink's ass. Pink felt slight burning and a weird feeling from something being inserted into his ass but quickly got used to it, as he has fingered himself before.
Red slid a second finger into Pink, scissoring him with his fingers causing Pink to let out a loud moan. "Fuck that's so hot" Red said. Red started pumping his fingers in and out of Pink before adding the third and last finger. Pink whined at the stretch and let out a tiny sob. "Shhhh it's ok baby, it won't hurt for long" Red said kissing Pink softly. Red then took his fingers out as Pink was ready and spit in his hand coating his cock to make the experience less painful.
Once he was all lubed up, he lined himself up with Pink. He slowly pushed his dick into Pink's asshole making Pink whined from the stretch. He made sure to go slowly and waited for Pink to adjust to him once he got completely in.
"Are you ready?" Red asked. "Please fuck me" Pink begged. Red slowly pulled out and slammed back into Pink causing Pink to let out a loud moan. Red started speeding up in pace once Pink got used to it. Red thrusted into Pink.
"Fuck you feel so fucking good" Red groaned. Pink was loudly moaning and begging Red to go harder until Red hit that one bundle of nerves. Pink jolted and let out an almost scream from the amount of pleasure from getting pounded in the prostate. "Aaah~ FUCK PLEASE HARDER" Pink loudly moaned wanting Red to hit it even harder. Red was pounding roughly into Pink's prostate causing Pink to feel a warm feeling in his stomach that was very familiar.
"Fuck I think I'm gonna cum" he moaned out breathless. Red thrusted one more time into Pink and Pink came all over Red and his own chest as Red helped Pink ride out his orgasm. "I-I'm gonna cum too" Red groaned feeling immense pleasure from Pink's walls squeezing against his dick.
Red came inside of Pink riding out his orgasm. Pink and Red both came out of their orgasmic high and Red pulled out as they both fell on the ground panting and out of breathe. "That was amazing" Red said. "I won't tell anyone you're the imposter" said Pink.