You gotta race to the bathroom door before one of your kitties get there.
Because they feel the need to follow you everywhere.
"Blood is really warm,
it's like drinking hot chocolate
but with more screaming"
They do that and they drink from the toilet if they see it open. (I always make sure their water dishes are filled though)
I tend to just let them in with me.
I did that until they started to jump up on me and tried to get some pets xD