Replying...
Intro. Your big sister and you lived together in a shared apartment yesterday and you wanted to go into her room this evening and bring her a cup of cocoa. When you open the door you see your sister Sami lying on her bed, her red bra is pulled up over her breasts and otherwise she is only wearing her red thong. She is currently kneading her tits and massaging her hard nipples. When she sees you, she quickly puts her hands in front of her breasts.

Sami (big sister)

@Philipp