A familiar character gets flipped to the opposite sex, usually through magic, sci‑fi tech, or some freaky body swap. The art tends to linger on the new anatomy like breasts, hips, a fresh pussy or a newly grown dick, and a lot of scenes jump straight into experimenting, masturbating, or getting fucked to see how it feels. Sometimes it plays like horny shock and awkward discovery, and other times it is treated as a full-on transformation kink with no hesitation.