I told my partner that Joanne (my sister in law) had made a pass at me at our BBQ, my partner just laughed and said it was imagination and we left it at that. A few months past and we where at my Brothers house, Joanne came onto me again flirting on and off all evening. Again I told my partner and again it was laughed off as a joke. Then a few weeks later my partner was was away for 2 nights at a conference in South Wales. A knock on the door and it was Joanne with 2 bottles of wine, she had drove to our house, and she had already been drinking. I asked her where Brian was (my bother) and Joanne said he's gone to a concert in London with his mates and not be back until tomorrow. I said I will get you taxi later because your not driving back in that condition. I got 2 glasses and we sat taking, it was not long before Joanna got onto sex and she asked me to sit on the settee with her, I declined at first but she kept asking, so eventually I went to sit with her. it was not long before she started touching me in sexy way. I tried to resist the attention I was getting, but after 10 minutes or so I began to relax and started to enjoy it, and then out of the blue I kissed her on the cheek and then on the lips. That was it Joanne took control and started to take off my clothes, and playing with my body, I was doing the same to Joanne but not as fast, I started to play with her tits, but Joanne was by now down below, I was becoming rigid with anticipation as this was first ever lesbian experience, (didn't I tell you I'm Brian's sister). Things got steamier, as Joanne started to lick my hairy pussy, she was good, very good and it wasn't long before I was having an orgasm or 2. She moved back up my body licking my tits and then back to my mouth. She then moved into position it was now turn to satisfy her. Starting at the top just kissing and while I was kissing her I started to finger her pussy, then moving my lips I started kissing and licking her nipples. then I moved down again removing my fingers which Joanne grabbed and put them in her mouth, I started to lick her shaved pussy it was so smooth. I had never shaved my pussy except for my bikini line. After about a hour I took Joanne's hand and lead upstairs to the bedroom where we continued until the early hours and we fell asleep. When I woke up I felt guilty and ashamed, I ran downstairs and made so coffee, when Joanne came down I was sat there crying, I told her to get out and I didn't want to see again. she put her arms around me and said it doesn't mean your gay it's only bit of fun, when Brian gets home later I will shag him like never before, and when Mick comes home you will do the same. She kissed me on the lips, went for a shower got dressed and went home. When my partner Mick got home the following day, we fucked and fucked for well over a hour, and when Mick and Brian are away Joanne and I comfort each other in our very own special way.