The last few days, I've been enjoying a new fantasy. A girl I dated quite a few years ago has stated messaging me and sounding like she wants to start things up again. One thing we really enjoyed together was sex....Any kind, really. We didn't fuck very often, but we both loved doing oral for the other, and we loved jerking off together. I've been thinking about how much I'd like to have this girl with me while we visited with my sister, and to have the girl grope my bulge, and then casually lower my zipper and pull my cock out. I've always wanted to show my cock to my sister, and I'm having some really good cums thinking about the girl jerking me off while my sister watches.