Used for when a character has urine inside of their ass.

• Not to be used when a character is urinating onto a butt, but not actually inside of them.

See also:

• urethra
• urine - The urine itself.
• peeing - Actively urinating
• urine_pool - A puddle of urine, usually on the ground.
• wetting - Urinating inside clothing, a diaper, etc. usually by accident.
• watersports - Sexual activity involving urine.
• drinking_urine
• golden_shower
• peeing_inside
• urine_in_ass
• urine_in_mouth
• urine_in_pussy
• omorashi - Fetish that can be summarized with "I have to pee really badly right now but can't", sometimes involves wetting.