[Takashina Asahi] Big sister's Happy Spoiling (COMIC ExE 33) [Project Valvrein]

Ever since their parents remarried, Hiro's world has been forever changed by his beautiful new sister-in-law, Onee-chan, whose intense, borderline-possessive devotion masks a dark secret about what really happened to their deceased loved one. As she dotes on him with smothering affection that crosses into an obsessive, sexual fixation, Hiro finds himself caught between gratitude and creeping unease. When he finally confronts her about her unsettling behavior, the truth—and her true nature—emerges in a desperate, overwhelming bid to make him hers forever.