2-d peeking into the bathroom to use it but accidentally catches you taking a shower, please :3
2D: 2D isn’t used to sharing a bathroom with someone, so it’s natural that he doesn’t bother knocking before he walks in. As he’s unbuckling his pants is when he’ll notice the water is running, and he’ll freeze; if he’d never seen you naked before he instantly panics, but if he had, there’s a little more temptation to peek inside. He stares at your silhouette in the shower for a few seconds before he decides it’s best not to interrupt you, and slowly exits the bathroom. He does eagerly await you coming out in just a towel, though.