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I decided to take care of my female student niece for a while. In the past, he used to say things like, "I'm going to marry you, Onii-chan!" Even now, without eating the food I prepared, he's lying on the sofa and engrossed in his smartphone game. …Hey, you can see my pants. I don't know if you're defenseless or you don't see me as a man, but I'll teach you what will happen if you show me that cute butt!