Maybe this could be in the form of stamina (Don't pee low stamina), it would be really weird to do that(especially if you are a girl). Something covering the screen and bathroom sounds could play.
Pee is all over the person ^-^ Also, there is no other organs seen when people pee. It just comes out without any animation xD You just see a yellow stream coming out from below the chest xD
This would be me, walking, making pee, cutting a tree, mining, fighting mobs, defeat the enderdragon while pissing. Correction: If I would do that, RIP Teddie.