Do they really have to share a bathroom area? He's just checking the whole place out, and ends up here, noting the shared aspect with some amusement. Yeah, he sure doesn't want to be the one stuck with cleaning duty. That's about the end of that until, while lingering in the doorway, he realizes there's someone in here. Though he's hardly inconspicuous, he tries to be quiet in his approach.

...If only to make it that much more surprising when he reaches a hand up to rattle the shower door loudly. Sorry whoever you are, he's just trying to have a fun time.

"How's the water?!"