Severus returns the kiss almost harshly, the overwhelming want finally finding an outlet. He sucks hard on Remus' tongue, a small noise of pleasure sounding deep in his throat. Then he pushes back, with his tongue, his mouth, his body, his entire being, pressing Remus against the wall.

Here he can let go of tight control and simply enjoy being and feeling. And he can't get enough of feeling Remus, not caring that there's a touch of desperation in the sounds he's making or the tight hold his hand has taken in Remus' hair.