When Severus' hips pushed up against him, Remus grabbed them with both hands, forcing them down again onto the bed. He wouldn't let anything disturb him in this. Not even Severus' wants, even if they coincided very well with his own.
He moaned and pushed his face deeper down between Severus' legs, then licked slowly up over the firm balls and further up along the underside of Severus' cock to the very tip. The taste and scent were so incredibly intense, intoxicating and Remus moaned again around the head of Severus' cock as he suckled lightly on it.
Somewhere in the back of his mind he registered that it was getting darker in the room, but it didn't reach his conscious mind which was focused entirely on sucking and tasting and holding Severus still so he could feast on his cock. He let go with one hand though, but only to take another, more gentle hold on Severus' balls, massaging them carefully.