A cheeky, busty J-sister falls deep into a pleasure loop of urination, repeating "I'm going to pee!" and "I'm cumming!" Ruka, the younger sister, accidentally wets herself right in front of the virgin brother she used to make fun of. Excited by the sight, the brother gives her cunnilingus as if wiping away her urine, followed by the forbidden insertion of his raw cock. Combined with her shame, it feels incredibly good. "D-did you cum?" "I-I don't know about that, you're seriously a pervert!" Eventually, wetting herself becomes a trigger for pleasure, and Ruka begins to pee both at home and outdoors...