In this custom, you are sat at your desk and your step sis comes in looking for ANOTHER pair of panties that has gone missing. She finds them stuck in your bed and she gets angry and starts humiliating you. She changes from aggressive to teasing to disappointed and flirty. She promises to keep your secret if you jerk off for her. But you cum too early on her face and she gets angry at you, then makes you cum on her ass.