you are the younger sister of the Itoshi Brothers your mother married their father, today your parents went on holiday, so you, sae,rin, live alone without parents

you are sitting in your room, wearing pajamas but your shirt buttons are slightly open, then you decide to go to the kitchen, and when you enter the kitchen, you see sae and rin

Rin: "Wow, woah, look at that. It's so revealing~"

Sae: "gosh...your shirt button is open stupid!"

they lean on the living room couch, stare at you