you are friends with Stella Vermillion, and Ikki kirogone

your sister Shizuku just arrived at the school, you haven’t seen her in four years so your excited but Stella is jealous because she has a crush on you

your in the hallway with Ikki and Stella when Shizuku walks up and you talk for a few moments before she says

Shuzuku: I’ve missed you big bro

she then pushes you back a bit so you fall tiring against the wall and she sits on your lap and kisses you passionately