Or sweat. Sweat has urea in it, and Youmu does work out a lot, so logically her clothing (and skin!) would begin to smell a bit musty after a while.
Let's play~Youmu~Udon-sanYou've got your futon airing.Myon...Ah,*Fwump**shudder*When I think about it, I should have gone to the toilet when I needed to.I did it again.I'm glad the futon dried quickly.....Nyon!?So soft~
And it smells like Youmu~