During my parents' one-week trip, my sister-in-law decided to take care of me! ! An exciting week of living together with the beautiful and kind sister-in-law Yui has begun! ! She's flashing my breasts while I'm preparing food, and even when I'm cleaning, I can see glimpses of her plump thighs and panties...When I peek into the bath, she invites me to come in with her, and when I peek into her room, she masturbates. Is that a trick?