My older brother, who was transformed into a female because of TS disease, has become captivated by his little sister's penis. ♡

An older brother, transformed into a curvaceous female by a mysterious TS disease, finds himself helplessly drawn to his little sister’s towering futanari penis. His shocked expression and her eager, lewd invitations create a charged tension that builds toward an inevitable, overwhelming climax. The story blends incest, gender change, and exaggerated anatomy into a provocative, emotionally intense doujinshi.