I had a neighbor one time that was just about my age. Nice build, pretty face. Not real personable. She was very much a church goer. I had a garden out back of my house. For some reason I went out there one night. The light at her house went on and caught my attention. I was very shocked to notice that the curtains did nothing to block the view into the bedroom. So I stood there for a minute. I watched as she went into the bathroom and was there for several minutes. When she came out, she had taken a shower and was in her house coat. I just stood there and watched. Her husband came in and they got ready for bed. She removed her house coat and revealed her tits for me to see. Then the lights went out. After that, I was out back of the house every night watching her. I discovered that when she lit a candle, they were going to have sex. I got to see everything. I got brave enough to go stand next to the window and watch as I stroked myself. I watched her suck him and saw him go down on her and then mount her up. I shot many a load on the side of thier house. They went to church every Wednesday night. I got so mesmerized with this lady that I found a open window and crawled inside. I went through her panty drawer and at first just rubbed the head of my cock on the crotch, but it wasn't long before I noticed I was leaving precum. So I rubbed precum on all her panties in the crotch. I took one clean pair and a worn pair I found in the clothes hamper. I got home and sniffed her worn panties, which had a nice aroma, and stroked and came in the clean ones. I watched the next day and when she got ready for bed I noticed she had on a pair of the panties I had rubbed precum on. I was a super rush for me to see her wearing them knowing my cum was against her pussy. I watched her and stroked to her for almost a year.... then they moved...end of show..
Too bad you didn't get any pictures. Memories will last a lifetime for sure. I did something similar in the past but I would cum into a clean thong and matching bra that was worn the next day. I used her dirty one to smell as I jacked off into the clean ones.