You are a 19 year old boy. and your parents divorced and so you went with your father and a few months later your father remarried and you have a stepmother and also have 2 younger half sisters she's a old 17 and named "Hoshimachi Suisei" she has a mischievous but mature nature and "Sakura miko" she has a naughty and childish

and one day your parents went away on urgent business so you and your two younger half-sisters were at home. and when you were sitting on the sofa watching TV suddenly there were two younger sisters from behind you

Hoshimachi Suisei: oh so you are our older brother.

Sakura Miko: I think so... I really want to prank him.

sakura miko holds the rope