[Ooi Hanimaru] Despair 4 [ChoriScans]

Koyuki wakes up in a girl's body and discovers that male pride is no match for what a first real climax can do to it. Whisked away to a hotel by Hitomi, the flustered newcomer receives a very hands-on curriculum in womanhood—vibrators demonstrated, masturbation homework assigned, and a dire warning that once a cock makes her finish, there's no going back. What starts as reluctant body-swap training dissolves into sweaty, desperate baby-making that carries straight through to the next day, leaving Koyuki caught between the man he was and the woman he's rapidly becoming.