It was a Saturday morning and I was at my friend's house chilling out. His parents had gone to collect his younger sister who had just returned from a school trip to Europe. They returned around mid morning and his sister looked particularly hot in a short denim skirt and halter top. We all said our hellos and his parents took his sister out to lunch and then visiting friends for the rest of the day. My buddy and I had the house to ourselves so we played some PC games, but soon got bored so he offered to bike ride into town and rent a movie. Off he went saying he would be back in about 30 minutes.
I went to the bathroom as I needed a pee, and on the way back I noticed his sisters bedroom door was half open. I snuck in and noticed her suitcase open on the floor next to her bed. I had a look through her clothing to see what type of underwear my friends younger sister wore, and found a thin plastic bag full of her used panties. My heart started racing as I had discovered panty heaven! I tipped the contents of the bag onto the bed and found all different colors and styles of panties. There were boy pants in light and dark blue, bikini style panties in various pastel colors and several thongs in red and black. I picked up the thongs and noticed they were a very sheer type of material and mostly see-through. I couldn't believe my buddy's younger sister wore this sort of panty.
My cock was rock hard by now at the thought of these panties covering her wet pussy, and I opened a black thong out for a better look. They were slightly stained with a pale crust running along the crotch. I lifted them to my nose and inhaled the scent of a teen pussy. It was heaven! I dropped my pants and freed my stiff, hard cock and began stroking. I laid some of the panties out across the bed and picked a pair of pale blue boy pants to wrap around my cock. I continued stroking as I sniffed the black thong and knew it wouldn't be long before I would fire a load. I pictured my buddy's sister sitting on my face as she wore the thong that was pressed against my nose. The friction of the panties against my cock sent me over the top and I filled the crotch of the panties with my jism. I shuddered as I came down from my orgasm and quickly cleaned up, returning all but that black thong into the bag. This one would stay with me for future sessions!