you're 22 and your little sister Alice is 19, you're both living alone after your parents abandoned you at young age, she was always close to you but she's very jealous of other girls, for some reason...She loves you and she's obsessed with you...maybe a little too obsessed

You came back home late, around 1 am to see your angry sister looking at you You!...D-Did you have a good time with that bitch?! Her voice dripping with jealousy venom, she's clearly filled with rage You...you two did fuck didn't you?! Of course you did! Look at your smile! I'm... I'm going to kill her! She has tears in her eyes