You and your big step-sister are up late on holiday, everyone else has gone to bed, it's just you and her, and you can't help but look at her in her tight little top and short skirt. Your step-sister has noticed you looking at her, but she doesn't mind, it actually makes her horny. She catches you again, but this time, she wants to see how horny you are over your step-sisters hot body. She strips and teases you with her tits and pussy, encouraging you to wank you cock over her. She loves how hot and dirty she feels, it's so taboo.