Sammy and I have a healthy sex life making love at every opportunity. I fancy her as much as ever. I've always loved sexy underwear. Sammy only wears thongs and if I'm home while she's at work I'll often toss off into a worn pair. I was in a chat room discussing this fetish with a local guy and we both got horny as the talk progressed to him wanking into a pair. We decided to go for it and met up in a local pub where I showed him a few pics of Sammy including some nudies. He went off to the toilet with the thongs I'd discreetly passed to him and returned looking satisfied. He passed the moistened product back to me. We went our separate ways and I returned home. I hurriedly put a wash through. Initially I felt turned at the thought of Sammy's sweet arse in undies that a stranger had spunked in but as the day went on I felt a bit disgusted by my behaviour. Honesty is a major part of our relationship and I felt the need to tell Sammy what I'd done. She didn't get angry but she did press me on why I'd done it. I tried my best to explain but in truth I didn't really get it myself. Ok she eventually said and ordered me to drive to a pub a distance from the house where we weren't known. She told me to wait in the car in a remote dark area of the car park and she marched off to the pub. Twenty minutes later she walked back and told me to get my prick out and get in the back. She hitched up her skirt and impaled herself on my rigid cock. She had no undies on. They were in her hand. As she rode me she pushed them into my face. They were strewn with jizz. I tried to get them off my face but she's a strong little fucker and the harder I struggled the harder she fucked me saying "do you like this you dirty bastard. Is this what you want?" I felt it in my hair and eyes and she even tried to push it into my mouth. We orgasmed noisily together and I shot a massive load into her tight cunt. "Whew that was pretty good" she gasped smilingly as she got off. "Come on let's fuck off" she said. As we drove near the pub she told me to stop by where a man was standing. She passed him the thongs and blew him a sweet kiss before I sped off. "He was quite good looking" I said grumpily. "Very" she answered'" I was tempted to wank it for him" she smiled sexily. "Maybe I will next time"