This happened years back, when I was still in college, but while I was back in my home state for summer vacation. I was hooking up with my friend’s ex, the first girl I met who was kinky, and our kinks happened to complement each others – she was submissive, loved anal sex (I think more than vaginal), and had wonderful curves. We hadn’t done much besides some spanking and fingering, but there was a lot of talking, and while I was at college she had masturbated on Skype for me a few times.
We ran into each other in the city and were planning on hanging out that evening anyway, so she invited me over to hang out for a bit before whatever we had planned. She wanted to shower and change before it, so she went to do that, but, knowing my predilection for panties, left her black g string sitting on her pillow.