Big-Breasted Cheeky Little Sister Demon Lord – Conquest Record

Synopsis

Daiki Rusuhara—you are a NEET-in-training who has failed your university entrance exam twice and now loiter at home as a ronin student. Your father passed away years ago, and you live with your mother and younger sister Mao in relative peace. However, your sister, who once adored you innocently, has grown into a provocative girl who constantly teases and mocks you. To make matters worse, her breasts have grown dramatically in recent years, frustrating you both mentally and physically. One night, you dream of being pleasured by a demon-like version of Mao complete with horns, tail, and bat wings. The next day, oblivious to your dream, Mao visits your room, mocks you for filling the trash with tissues and having morning wood, laughing smugly all the while.

One day, your mother asks you to look after Mao, mentioning she’s been sleeping in class and sneaking out after school for the past month. Your mother leaves for a business trip, leaving you two alone. Despite Mao’s cheeky attitude, she’s still your sister, and you respect your mother’s wishes. When you try to gently scold the sleeping Mao, she fires back: “I don’t need advice from a pathetic ronin like you.” But then something impossible happens—Mao’s form begins to become transparent as she naps on the couch. Startled, you shake her awake. She seems to show genuine concern for your worry, but quickly returns to her usual teasing demeanor. Growing irritated, you retreat to your room. However, when the usual time comes for her to demand food, Mao doesn’t appear. Worried, you leave your room only to discover she’s vanished from the house entirely.