Remus let out a soft humm in pleasure as his tongue slipped into Severus' mouth and roamed it slowly, so happy and grateful that he'd been given another chance... no, that he'd managed to fight himself into getting a second chance at this. His other hand slid off the wall and pushed into Severus' hair as well, both of them now holding Severus in the kiss, as his body was holding (trapping) the man against the wall.
"I won't let you either," Remus murmured as he drew out briefly for a breath, then dived in again, quite unable to stop kissing deeply now that they'd started. It felt so good, tasted so right, as if this was how it truly was supposed to be, that this was his. It would take a lot to push him away from that conviction, he realised. He was prepared to fight for it, and fight hard. And now he knew how Dora must've felt, fighting against Remus' reluctance.
This had to be different though, he had to believe that. Had to believe that Severus wouldn't truly give in if he didn't truly want this. He wasn't Remus after all, he wasn't afraid to hurt, to push away and only go for what he wanted. For once Remus was inordinately happy that this man was a Slytherin.