Snape froze mid-writhe at the sheer unexpectedness of Al's 'Won't', and boggled with utter incomprehension at the refusal.
Then Al went on to explain, in the most wonderfully, maddeningly slow and tantalising way possible, with lips moving against Severus' skin even as he spoke, with gentle, teasing hands and a solid, compact body and warm skin and a lovely hard cock.
It would've been easy enough for him to reach down, take that prodding length in hand, end this with a few expert twists of his wrist.
Too easy to be interesting, he realised as a bit more of his brain surfaced from the hot haze of need.
No, for the first time Al was taking the lead. Al was pursuing him. Al wanted him.
For such a rare treat, declaring himself was a small price to pay.
"Yessss..." he hissed, moving again, a slow writhe that drove Al's fingers deep. Black eyes glittered through thick coils of white steam, through hanging skeins of wet black hair.