[Of course, the voice function is working, but Gamzee certainly hasn't figured that out yet. Instead his eyes are drawn to Maxim's crotch in confusion (and a little lust), and then he realizes what the other boy is implying, and looks down at himself, blinking in surprise at his erection, then reddening abruptly.

There is a brief, fairly comical pantomime of the lanky boy trying to shove down on the tent in his shorts, as though he can make the thing go soft by sheer physical friction, then him biting his bottom lip as that feels a little too good, then pulling his bony knees up to his chest, and giving the Gryffindor an apologetic, highly embarrassed shrug.]