I was visiting my friend at her school and staying the night in her dorm. Her roommate had gone home for the weekend. I was horny all night and wanted to get off really badly, but as she was still there, I could not. The next morning she had a class early, but I was just going to stay and go to lunch with her later. So, she left for class in the morning.
I went through her and her roommate's drawers, looking at their panties and other things. I couldn't find any pantyhose from either of them, but her roommate had some rather skimpy underwear. I put on some of my friend's panties and one of her red silky bras and then found a denim skirt in her closet, which I have looked up before on multiple occasions.
I put on some of her roommate's high heels and sniffed my friend's dirty panties while I worked myself off. I found a dirty sock of hers in her laundry and slid it on my cock. I laid on her bed wearing her and her roommate's stuff and came into her sock, which I just put back in her laundry. I think looking at myself in her roommate's shoes sent me over the edge.
I put everything back the way it was, except for her sock which now had my jizz in it. I took some of my friend's used panties and one of her bras out of her laundry and took them home with me.