Wank Buddy and sis - Knickers.

I hooked up with a guy on a car park last week. He’s in his early twenties. Though much younger than me he is also Bi and - just like myself, he loves cock play, sucking, wanking, watching guys wank and cum.
We had a good session of around 20mins where I wanked him off and he sucked me dry. He has an impressive tool. A couple of nights later I had chance to go to the same car park area where I hoped to meet up with him again. With delight, he turned up and jumped in the car. He said his house was empty for the next few hours so we went back there for a more relaxed session. We went to his bedroom where he produced some porn mags and pics and put on his PC. We began wanking. He realised I liked the knicker cum stuff, left the room and came back in with a pair of white cotton knickers. “Here”, he said, “wank into these. They’re my sisters”. I took them from him and due to a slight stain could tell they were dirty ones. I sniffed them and tongued the crotch. I was overjoyed and wanked myself silly until I came into the soft cotton gusset of his sister’s knickers. My wank buddy, followed closely after me and spurted on top of my spunk, also into his sister’s knickers.
I look forward to many more fine sessions with my new wank buddy.