Risky sex!

This happened a few years ago with an ex-girlfriend who I shall call B. I rarely viited her house as she lived with her widowed mother and opportunitie for any action were limited. However one night all three of us were chatting when her mother said she was going to bed and promptly left us alone. No sooner was she out of the room when we had our tongues down each other's throats. I started to play with B's tits and eventually manged to uncover them and give her nipples a good licking and sucking. My hand wandered to her crotch and I rubbed her pussy outside of her jeans for about 30 seconds before reaching for her zip. I quickly loosened her jeans and pushed them down slightly so I could get better access to her fanny. My first 2 fingers slipped in easily - B - was always very wet! I continued to play with her pussy and clit and sometimes her bum hole. I had a raging hard-on by now and B got it out of my jeans and wanked me off. I couldn't come as I was a bit nervous of her mother discvovering us. I said to B that I was frustrated we couldn't have sex and to my surprise she said we could. She said her mum wouldn't come back into the sitting room. I then got off the couch and got B to get on all fours with her leaning on the sofa. I pulled her jeans and pants down to expose her soaking wet pussy and her lovely arse. I was almost tempted to give her pussy a licking first but I was still nervous about how close her mom was so I just entered her from behind and slowly started shagging her gorgeous wet pussy. Needless to say the thrill of the situation meant that it didn't take long to inrease the wetness of her pussy with a load of cum. We sorted ourselves out and I got ready to go home. B saw me to the back door and we had a goodnight kiss - I was still horny as was B so I got into her pants again and gave her pussy a good fingering before gong home and having a wank over what had just happened.