That bare bark felt interesting, his eyes were clouded by lust as he tugged that hair back a little rougher then intended, so that his eyes met his. And they said it all. Filled with hate and lust. Confused and anger. Sirius flipped them around so that Snape was the one pressed up against the tree as he caught the other boys lips in a harsh kiss, biting hard down on his lower lip.

His hands untangled them from that surprisingly nice hair and ran down Snape's sides, his nails pressing into the other boy as he reached those school pants. There was no waiting this time. No chance for Snape to back out as he slid that hand down the front of Snape's pants and cupped him hard, squeezing that length with a smirk.

"Someones enjoying this" he purred as he felt Snape's length. Sirius was bigger. He noted happily.