Hands were buried in Lupin's hair as Severus opened his mouth to let Remus use his tongue, as if to enhance the movements of his hips. There were so many new sensations, cold and hot, pain and pleasure. The cold wall rubbed roughly against Severus' back, a hot tongue was buried in his mouth (and Severus did suck and lick and bite Remus' lips and tongue as well), Remus' kisses and his hands on Severus' body gave so much pleasure, contrasting the pain evoked by the hard cock in his arse. Slowly, as they moved and kissed, the pain lessened enough for Severus to relish the unknown sensations.
It felt good that his body had been pliant enough to allow Remus inside, to widen to accomodate his lovely large cock. It felt good when it stroked over a certain spot - his prostate, Severus guessed - and the rim of his opening seemed to have too many nerves, since it felt so good when Remus had pulled out far enough for the head of his cock to move over the muscles. Severus tried to tighen his grip around Remus' waist, to pull Remus back in, as deep as possible. Severus sighed, whipered as the cock slid in almost too far. He moved again, undulating his hips, as if to wring out every sensation he possibly could get from this.
Severus pulled away to look at his lover. 'Feels good,' he sighed, overwhelmed by the intensity in this. 'Think you can move faster now.'