Rez wasn't trying to break him. That wouldn't be much fun. So yeah, he went at it slowly at first, inch by inch delving inside of him until he was buried up to the hilt. The compliment made him smirk. "Yeah?" He asked, licking his lips. "You like my cock inside you?" He knew he did. But Rez liked to have his ego stroked when he was, well, stroking someone else.
The request made him moan, as did those impatient hips which Rez reached out to grab, nails digging into them as he fought to hold them still, rocking slow, long, and deep for just a moment, trying to calm himself down so he didn't just lose it in an instant.
Once he felt relatively assured that he could go for it without losing his shit, Rez started to pound into him, tight and sharp thrusts driving his hard dick into Riley's tight hole as his entire body trembled. "Mmm.. fuck.. You feel so fuckin' good." He moaned out the words, trying to keep it as quiet as possible, still mildly aware of where they were right now.
The sound of his balls slapping against the other man's ass reverberated off of the white walls. And then he pushed himself up, using his toes against the bed for leverage as one hand helped hold him up, placed to the side of Riley's head, the other wrapping around the other man's cock to stroke him in time with his hips, his chest crushing Riley's knees up against him as he pressed forward to kiss him, hungry lips sloppily seeking out Riley's own.