Sirius gasped at that bite, it was hot and deep. Hurt just enough that it felt perfect. His hands tangled in Severus shirt as he bit his lip from making any moaning sounds. Can't let Snape know how much THAT felt good.

Sirius smirked as he tilted his head down to meet eyes with Snape at his words.

"Sh. Tell noone" he said, teasingly just a tad as his own fingers finally got the last button of Snape's shirt undone. And he ran his hands over that perfectly white skin. That pale body shouldn't be so hot. So, forbidden to Sirius's touch.

"Harder" He said, tilting his neck again. Come on Snape. Don't be shy. Hurt him.