Watching Me With Her Panties

When I was 24 and still living at home my sisters friend was staying with us off and on all summer. She was 19 and super hot. I always enjoyed her panties and took them from her laundry bin often. One time she walked in on me and caught me jerking with her panties. She said I knew you were playing with my panties because she had seen them all wriggled and a few stains in them. She asked if she could watch, I could not make any words out so she took that as a yes. She sat at the chair at my desk and pulled her shorts and panties down and played with herself while I jerked. I shot all over her panties. She said thats what was all over in the last time she stayed here. She said we could do this again. We did many times that summer.