There's quite a lot of violence in their dealings with each other, but if truth be told, Severus would have it no other way. He pulled away from Sirius, letting those pinches elongate he lust, and slipped his hands back to his belt to tug it open.

Once more, Severus stood with pale skin and dark eyes and bruises in front of Sirius Black. He smouldered and waited for Sirius to stop fucking him with his eyes. Severus himself was not a visual person. He noted that Sirius was charming and handsome, but nudity did not get him hard. It was the scratches. The briefness of pain. The kissing.

Severus longed to be touched. Anyway he could.