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The ultimate porn where the girl pretends she doesn't know her step-bro is about to dry hump her. Later she says she knew the whole time. Also a funny way to call step-sibs you want to trick into doing stuff.
My step-sis said she didn't know I was about to take her virginity. Then she laughed and said I was the dumbest step-bro ever.
My step-sis told me she didn't know I was going to sneak into her room. She lied. I knew she knew.
My step-sis fake cried during the whole thing. Then she texted me: 'I knew you were going to do that.'