Although he's not a relative, a friend who was staying in my house left a pair of his underwear (FOTL) in the closet when he went on an extended trip. The boxer briefs are one size smaller than what I wear and although I've tried them on, I haven't worn them for an extended period (I'm afraid I might stretch them out of shape--is that true??), I think I will wear them tonight when I crawl under the sheets. He washed everything before he left, so he didn't leave my anything to smell, but just putting them on is a turn-on.