As someone who’s bladder has been incredibly inconsistent for most of his life and has done some desperate searches after particularly bad days, goodnites makes pull ups that can fit someone up to 160 pounds, and that’s probably a better option than a full on diaper which is hard to put on by yourself and incredibly bulky/noticeable, though obviously the diaper would hold more urine
Yeah, like I said, I’ve been desperate enough to fall down the rabbit hole on this topic more than once
At a certain point, Mahiro should probably just go see a doctor. "Still adjusting to no longer having a penis" is an excuse that can only take you so far.