Big Breasted Cheeky Little Sister Demon Lord~Subjugation Record of the Big Dick~

Synopsis

Taiki Rusuhara—you are a NEET candidate who has failed your university entrance exam twice and are now a ronin (exam retake student) wasting away at home. Your father passed away years ago, and you live with your mother and younger sister Mao in a peaceful, if not particularly close-knit household. However, Mao, who once innocently adored you, has grown into a cocky girl who teases and mocks you at every opportunity. To make matters worse, her breasts have grown dramatically over the past few years, and now she’s frustrating you in every way—physically included. One night, frustrated by her arrogant attitude and massive breasts, you have a dream where a demon-like Mao—complete with horns, tail, and bat wings—gives you a paizuri that drives you to climax. Unaware of your dream, Mao visits your room the next morning, mocking you for filling the trash can with tissues and teasing you about your morning wood.

One day, your mother asks you to look after Mao before going on a business trip. She’s noticed Mao falling asleep in class and going out without explanation. Despite her cockiness, she’s still your sister, so you agree to keep an eye on her during your mother’s absence. When you try to gently scold the sleeping Mao at home, she shoots back with “I don’t want advice from a loser ronin.” But then something strange happens—Mao begins to fade and become transparent as she naps on the sofa. Startled and confused, you shake her awake. She seems momentarily sweet when she realizes you’re concerned about her, but quickly returns to her usual provocative self. Annoyed, you retreat to your room. But when the usual time comes for her to demand you cook, Mao doesn’t appear. A sense of unease creeps in as you realize she’s nowhere in the house…