I decided to take care of my high school niece for a while. Before, he used to say things like, I'll marry you, Onii-chan! Even now, he hasn't eaten the food I prepared, and is lying on the sofa, engrossed in playing games on his smartphone. …Hey, you can see my pants. I don't know if you're on the defensive or if you don't consider me a man, but I'll teach you what happens if you show me that cute butt!