My entire relationship with Helen revolved around sex. The irony of this is that I'm not greatly endowed or anything like that, just a regular 6", but what I maybe lacked in size I more than made up for in staying power, enthusiasm and a dirty mind - which can take you a long way! At the time I shared a flat with a woman, purely platonic, but there were times when the 2 of us came close to breaking that. For once Helen was staying at my flat and she drove across from Preston already dressed to go out, looking an absolute million dollars - with the usual dress, heels and stockings. I can't remember where we went, but it will almost certainly have been for a meal, on for a few drinks and then back to the flat. It was winter time, so when we got back the first thing I did was turn on the gas fire and get some drinks sorted. No sign of my flatmate so the two of us huddled by the fire trying to get warm. Gradually one thing led to another and before long we were at it on the settee. I unzipped her dress and pulled it over her head, to be greeted by the most glorious sight. She was in the stockings as I said, but no suspender belt this time, she had on a green and black basque. I asked her to give me a twirl and she stood up and obliged - black stockings, heels, the basque and thong which disappeared somewhere up the cheeks of her arse so that it was fully on display. I nearly came on the spot. I stood up and my hands were all over her, popping her boobs out of the top and rubbing her through the silky thong. We fell to the floor in front of the fire where I took her thong down and went down on her immediately. As usual, she was soaking wet and came within seconds of my tongue touching her clit. I carried on licking up and down her labia and lapping up her juices, before working my way back up to chew on her nipples and ease my cock into her. It was around now that the thought occurred to me that we could be interrupted by my flatmate at any time so I considered telling Helen, then thought "sod it", if we're caught she can always join in! The thought spurred me on and I decided I should be the gentleman and be the one lying on the carpet, so spun us round so that Helen was riding me. The sight was magnificent, still in her basque, stockings and heels, she rode me me for what seemed like ages. Whenever I felt close to cumming I made sure we backed off for a while, I wanted to enjoy every moment of this. In this position Helen could easily play with her clit whilst I played with her nipples and we just kept going and going. Her cunt was flowing, I was soaked, she was moaning and groaning and we must have been making a hell of a racket until I couldn't contain myself any longer and just exploded inside her. We lay there for quite some time but sadly my flatmate never did put in an appearance. Eventually we staggered off to bed where we were too knackered to try again that night, but it didn't stop us having another go in the morning - as I recall I got a lovely slurpy blow job whilst she frigged herself to an orgasm. She left before my flatmate got in - she'd clearly had a good night as well!Every time I met Helen we seemed to be able to find something else to excite us and make the sex even better and I'll bring you some more details later.