Sure, here's one. When I was about 12-13 I was in my parents bedroom with some of my dad's Hustler mags open and jerking off. My little sister and her friend decided to burst in and catch me. Well, of course they startled me and I yelled at first but they convinced me to let them watch. I, being the always horny teen agreed. I continued pulling on my cock, hoping they might join in (and maybe let me fuck my sisters friend who was my age) when, to my surprise, they took off their pants and started rubbing their barely hair covered cunts. It didn't take any of us long to cum after that. I was first and splashed my cum all over both of them which set them off. Good times, in the 1970's, good times.