Over the next few days, it got worse and worse. Severus looked more often. And for longer periods of time. It was starting to make him itch, to see Sirius there, to watch him with Remus, to see him flirt with any girl that caught his eyes. Shagging once meant nothing. Nothing to Sirius. In fact, that was likely all that they would do on Friday.

That... Angered him. And he had no idea why.

James had had enough of Snape and his staring by Wednesday. 'Snivellus. Let's go for a walk." He expected Sirius to back him up.