[Natsukawa Kagari] The Day I Became a Mother [JusenkyoTL]

A shocked daughter discovers her father has injected her with a drug that transformed her into a young woman, and as her body changes she is forced into an intimate, incestuous encounter with him. The story follows her escalating arousal, the father's predatory touch, and the overwhelming pleasure as she experiences both the shock of her new form and the forbidden desire. The narrative builds to a climax of intense, explicit intimacy that reveals the true nature of their twisted relationship.