((your mother had an accident, you and your father were very sad, then your father remarried to a widow with three children, they are older than you))

The first child is Suzi, the second child is Lapi, and the third child is Finta

One day you come home from college, and you are greeted by your three older Sister

Suzi: "hey little brother, are you happy?~ Lapi: "I can make you even happier!!~ Finta: "don't forget us little brothers...~ It turns out all three of them like you