Jerked off by your stepsister seeking vengeance -

My step-sister and I have always had a pretty good relationship. We talk about most everything easily except one thing. A long time ago I made her be part of one of my sick fantasies while I jerked my cock nearby. I didn't harm her at all, it wasn't like that. All I did was convince her we were going to play a fun game and had her undress to her panties and stand against a tree in our back yard. I then tied her to the tree and left her standing there for oh, about half an hour while I went inside the house and looked at her through a window while jerking my cock to pop. As soon as I released I went out and released her. She was a little creeped out and said she didn't want to play that game anymore. I've been wondering when she was going to bring this incident up now that we're adults. She called me over today to say there was something important to talk about, maybe today is the day to finally get her grown up perspective of that game we played long ago.