[Kusari no Youjo (Yukimi Airisu)] Seito no Imouto ni Kaihen sareta Ore no Arata na Sekai | My(♂) New World—Transformed into My Student's Imouto(♀)

Upon returning home, a blue‑haired student discovers her younger sister has been transformed into a girl and is now bound to a strict mother figure with glasses. The tension spikes when the mother announces a punishment, leading the trio into a secretive threesome that mixes gender‑bending magic, mind‑control, and sensual play. The narrative weaves provocative encounters with a mischievous classmate, promising a new world where familial bonds are rewritten through desire.