I was 13-14 the bedrooms were upstairs , along with the bathroom. I watched out the upstairs door at the top of the stairs. I knew I was going to play with my new toy. I saw my sister start up the stairs. I went into my bedroom. Pulled my pjs down . Taking the shirt off . I turned the chair towards the door. I was really excited. I was stroking my man part . The upstairs door opened . I’m half laying in the chair. My sister looks in ! Sees what I’m doing . She takes a step into my bedroom. She put a hand on the doorknob. She was watching ! I was hoping she would put her hand around my dick . Or take her bra off and show me her boobs! That didn’t happen. But I did explode a bunch of cum all over me . When I was done stroking and milking all the cum . I was satisfied ! I asked her if she helped her boyfriend? She said I should close the door when I’m playing with my tiny little dick ! 😂 she must have seen other dicks to compare too!