Your Step-Sister is home when she should be out on a date. The guy lied to her and is now out with someone else. She's upset, and now doubting why she ever thought he would like her. You can tell her confidence has been knocked. So you give her a compliment. You tell her she's super hot, her lips and tits are amazing, and all your friends talk about fucking her. She's blushing, rubbing your arm, playing with hands, asking you to tell her more.
She get's called by Step-Mom and leaves, but she isn't finished with the conversation.
Everyone is in bed, it's late. Your Step-Sister is on top of you, shaking you, telling you to be quiet. Putting her hand over your mouth. Undressing. She tells you she knows you were flirting with her. You want her too. You try and protest, but she is too horny. She knows you're lying. You just need to be quiet. She will suck and fuck you. Milking your cock, draining your balls into her pussy. Don't let anyone hear you.