These videos are great, but none of them beats the one in my own memory from college... in my own room upstairs at a party. A beautiful dark haired girl was sitting on my lap, rubbing up against me, then putting her hands behind her back and squeezing my erection through my pants, my hands around her waist. The only skin contact she made was a brief moment when my head peaked out over my boxers, but fuck how that felt so crazy. Nothing more happened... turns out she had a boyfriend or something. We didn't end up having sex and I never knew her name, but when she left I badly needed to rub one out become I could go down and rejoin the party.
I walked past her on campus a few weeks later. She looked away with an embarrassed smile before we made eye contact, and she was gone in a blur. I never saw her again but the memory makes for great masturbatory fodder even to this day.