It was too much. Severus had been prepared for something, but what this turned out to be happened to go far, far beyond his abilities of reason.

It didn't hurt, but it was really uncomfortable. Enough to make him lower his head and hiss when Sirius pressed large fingers into him. "Knock it off!" Someone never heard of preparation. It wasn't as if he read up on the ways of anal sex. He barely knew the 'proper' way to shag someone and he really never imagined doing it.

Something was off here. He wasn't sure what, but he knew that he didn't appreciate it. His fingers curled against the robe.

"Just get on with it."