Which obviously made Gabe grin all over again, mischievous and delighted all in one. It also made him want to tug William in and ruin his professionalism all over again.
He didn't, for which he should get a reward far more exciting than having to wrangle a fuckton of teenagers. He just leaned in against William's shoulder as he started to brush past, and muttered, "Yeah yeah yeah," still grinning, against William's ear.
Then he was past, striding towards his knot of still-giggling students. "Right, you lot. Round up the rest, and I assume that when we get back downstairs, I'm only going to be pleasantly surprised at the state of the commonroom, right?"