... I found the answer... :D
http://www.mangago.me/read-manga/mayou_otoko/tr/88440/page/98/
yeah, he did it bro
I'm still trying to figure out WHY he did. One minute he's tied up and watching his man jack off, the next minute he pees. What is up with that ???
it's possible, it happens. sometimes you can't really control your body, especially in situations where you're completely losing control of it. i'm guessing he got too excited and was being teased too much, so he lost control...and then...well...yeah.
Several pages previously, Misoto(sp) was talking about incontinence - the inability to restrain from urination or defecation. Urination is a fetish for some. I can only imagine that the "fetish fueled" curiosity of Misoto got the better of him.
Did he urinate?
http://www.mangago.me/read-manga/mayou_otoko/tr/88440/page/84/