Good question; Gabe pondered it as he slipped out the door, drawing William with him, away from the knowing looks and stifled grins of their colleagues. (Gabe didn't care, and William's response to the ribbing they were going to get about this magnificent display was going to be brilliant. Gabe was already planning his own personal round of I'm not complaining, but what were you thinking?)
He dragged the door closed behind them, and... well, since everything seemed to align so well, took the opportunity to nudge William back against it. "Mine's closer," he answered, getting his own revenge against William's earlobe. "But yours is quieter." It would be really, really sad if some poor Slytherin kid wound up turned into a mink for knocking on his door at the wrong time. And anything for the next hour two hours was going to be the wrong time.
"Um," a small voice said behind him, and Gabe looked reluctantly over his shoulder. Two of them, relatively small, one wearing a Gryffindor tie and one holding up a roll of parchment like a talisman. That one squeaked, "The professor said I should..."
Gabe tugged William away down the corridor, and geatured back towards the door. "Very conscientious of you. All yours!"