Happened five years ago. Bit of a thing for panties ever since.
I was traveling around North America with my (now ex) girlfriend. She has been away for four months previous studying abroad and apart from a few hot IM conversations here and there we both had some catching up to do! but this has nothing to do with that.
We had a busy schedule and a tight budget so privacy was very limited. A few weeks into the trip with little privacy in that time I was at breaking point, without the occasional 'longer shower' here and there I was very deprived and very horny.
On coming into Montreal it was freezing, late and very dark. Another hostel and again another night with no privacy. On entering the darkened dorm, straight away I notice something on the bed I was to sleep in, small and black. I said something out of shock at first, but she didn't understand, and didn't see. To my surprise and great pleasure it was a small lacey thong!
As she my gf showered I made up my bed and looked at the thong a bit more, touched it, had a quick sly smell, definately worn. My heart pounded and my head swam. I placed them in my pocket and headed for the showers.
I knew it wasn't going to take long, but I wanted to make it last. I looked at the thong again, it was a french (or french Canadian brand) with french writing on the tag and it was tiny! a size 6 UK at most! and noticeable yet not heavy white marks in the crotch of it. Jackpot!
I wrapped it around my now hard, throbbing cock and jerked slow with it, then smelt it, thinking about who's it could be, whether it was left deliberately or by accident. Before too long I was ready to explode.
I wanted it to go on longer but couldn't take it any more. I licked the lightly stained crotch and inhaled deeply as I exploded in the shower.
Quickly cleaned up as best I could, relaxed back to earth, placed the panties under the bed with no one the wiser and drifted off to a VERY good nights sleep.
I am disappointed I didn't take it, I would of now that's for sure, but not then. I still also wonder whose it was.... Did you lose a thong in a hostel in Montreal?