When I was traveling alone, I made arrangements to stay at my soon to be sister-in-law's apartment. She was leaving that same day, so I would have the place to myself. When I arrived, I went to her room and found her dirty laundry in the closet. On top was a fresh pair of panties that we're still a bit wet from her pussy. I laid on her bed with those panties over my face and jerked off. Just when I was getting ready to cum, I used her dirty panties to catch my wad. Then I went to her clean underwear drawer and dabbed a little bit of cum on to each pair of her panties, right in the crotch. Whenever I see her I think about how my cum was touching her tight pussy for over a week with every "clean" pair of underwear she put on.

Once she was drunk and passed out and I looked at her boobs, too, but that's for another story.