[Kirimoto Yuuji] Private Ladyboy Academy Chapter 1-3

At an academy where boys are trained to dress and behave as the perfect girls, Aida—sweet-faced in her sailor uniform and twin tails—discovers the consequences of one clumsy mistake when a stern older student corners her. The scene quickly spirals into rough, desperate intimacy as she protests "stop it, Aida!" while her lithe body is taken from behind, then shifts to a teasing oral encounter with a boy who blushes at his own arousal. The finale reveals the twist: Aida is actually the principal's son, and he must now give his "daughter's" hand in marriage to the young man who claimed her.