That's her full, distended bladder bulging out there that he's massaging, right? Teasing her over a toilet? Because we definitely need more of that -- focus on the holding and the bulging bladder. I can't find any art anywhere of a girl holding it, forced or willingly, that hasn't been focused on wetting, let alone one with a bladder bulge.
Nope, you've gotta hold it, Yuri.I-I need to pee!But... I...B-But this is...Didn't you promise you wouldn't pee until the end of today?