[Genki Tarou] Turning My Father's Secret Love Child Into a Sex-Use Onahole

A grieving son returns home after his father's death and discovers his secret half‑sister Reira, a childlike girl raised in isolation, now ready to become his personal sex toy. He decides to treat her as a pet, using her helpless body for his pleasure while she endures endless, ravenous encounters that blur the line between affection and exploitation. The story follows his obsessive, daily rituals that bind them together in a twisted, forbidden bond.