"Classmate A" lol, can't decide if he doesn't care to remember her, or he cared but just never got an opportunity to find out a name. Either way it's funny
Actually piss by itself is clean (if taken directly from the source). The main problem is that anal isn't made to take such a large amount of liquid (duh) so she will either get a horrible stomachache... or spill most of it on the bed