Sirius smirked at that yelp. His eyes watching Snape's cock grown and harden with every thrust of his finger. He'd found it. He'd found Snape's G-spot. Let it never be said that Sirius was'nt a natural born lover, when it came to either sex.

He gently eased that finger out of Snape, before pushed two into him now, a little faster then he had put the first one in. They quickly pressed up against that g-spot again, rubbing it gently as his other hand wrapped around that now hard cock of Snape's. Jerking it almost agonizingly slow compared to the thrust of his fingers.

"Hm, you've never looked hotter Severus" he purred gently into the night, as his eyes look in the sight of the pale boy as he rocked back on the fingers.