Another rec.
The Parable of the Shower, by Leah Bobet.
The great and terrible laughter of the angel of the one true God makes thy knees tremble, but thou refusest to fall down upon them. For one thing, the shower in which thou showerest is slippery, and the LORD knows it is simple enough to break an ankle or a hip or an arm in the shower without the intervention of an angel of the LORD.
Great fun.