A week ago forgot my phone in the bathroom, my stepsister was in the shower and forgot to lock the door. I thought I would slip in grab my phone and get out before she saw me and freaked. Well she never saw me, but I saw, and definitely heard her! She was making her self cum over and over. Now I can't get it out of my head, I broke the lock on her bedroom door without her knowing. I pester her when she is in the shower knocking and saying hurry up so she can't masturbate and then I wait, knowing she will do it in her bedroom, so I can walk in on her. It works, she is really pissed at first, denies everything, including the times I know she has watched me, neither of us has much experience, so after talking a bit she hesitantly agrees to experiment a together.

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