Our threesome with James provided much to talk about over the coming weeks. On one hand the long gaps between meets were frustrating, but on the other hand they provided time for very erotic chats and sharing of experiences, thoughts and fantasies. Her husbands nights away provided good opportunity for phone sex and we did get the occasional car quickie, usually limited to fingering and her sucking my cock before returning to work! Sarah was due to go on a course and said she would be staying with her friend Helen, a teacher in a public school, who happened to live a very short walk from the venue. Helen was on holiday that week so invited Sarah to stay a second night and she decided to take the Friday off so they could go shopping. She travelled down on the train the night before the course and sent me a few cheeky pics of her stockingtops as she enjoyed a couple of G&T's in First Class. Helen was one of the girls she had met up with a few weeks earlier and Sarah told me she was one of the two who snuck off together despite one being married and Helen having had a few boyfriends. I teased Sarah about some girl on girl fun and she told me to stop being such a perv! They had a meal at Helen's apartment and caught up with their typical girlie chats, and Sarah and I shared a few messages over the evening. There had clearly been a few more glasses of Prosecco shared and Helen asked Sarah who was messaging her, she confided that she had a friend.... with benefits! Helen laughed and said words to the effect of "you dark horse!" Adding that she didn't blame her what with her "being married to that arrogant tosser" - Helen clearly not being one to mince her words! Helen demanded to know more, but said she was going to get comfy in her nightwear before Sarah shared the details! Sarah decided to do the same and put on her little nightie before getting back on the sofa. Helen assumed she was seeing a similar aged guy in a full blown affair, and was aghast when Sarah told her it was a former colleague, 20 years her senior and was very sexual! Helen topped up her glass, clearly wanting to know more and Sarah went on to tell her about our initial meeting and subsequent chats, to which Helen wanted to know in detail what we had done - Sarah admitted to me that she was aroused herself as she recounted telling Helen about sending me pics and our first phone sex session just after her husband had fucked her. I messaged her and she told me she was telling Helen about me and that it was making her horny, and she would be using her vibrator later in bed. It was pretty clear what was going to happen and Sarah clearly did not look at her phone for some time...my imagination running wild! When I did finally get a message, it contained a few alcohol induced typos but the message was clear, the chat had made them both horny, Helen had sat next to Sarah and they shared experiences, Sarah told her that she and the others knew Helen was bi and Helen then told Sarah she wanted to touch her... Sarah's response was "ok"! Helen then started caressing Sarah's breast, and continued asking about what I did to make her cum... Sarah told her about her tendency to cum over and over as I licked her and how she had swallowed cum for the first time ever, how I loved having her in her stockings and heels and how my thick cock filled her pussy. Helen had by now moved her hand between Sarah's thighs and told her to part her legs, before gently touching her smooth wet pussy, commenting on how lovely and wet she was! Sarah told me she was in a haze, tipsy, horny and feeling so naughty as Helen started to probe her pussy. Helen was clearly a competent seductress and slowly upped the ante, persuading Sarah to do the same to her, before giving her oral sex. It was whilst Helen licked and teased her pussy, stopping only to ask more questions, which Sarah answered as she tingled with pleasure from her friends tongue and fingers. Helen then asked what was the naughtiest horniest thing she had done with me and Sarah in the midst of her moans of pleasure said "he shared me with another man!" Helen was shocked and wanted more, Sarah then found herself with her hand placed between Helen's legs as she told her friend how she had been pleasured and fucked by myself and James for a whole afternoon in a hotelroom! Helen was getting more and more aroused, and Sarah became more confident, asking Helen what she wanted her to do. Helen replied suck my nipple and finger me initially, and Sarah ticked off another first as she took her friend's breast in her hand and started gently sucking her nipple, focussing on how it made her feel when her own were being sucked. Helen then asked "will you lick me..?" And Sarah silently moved her head down and for the first time ever tasted another woman. She could not believe what was happening but didn't want to stop, she wanted to make Helen cum and she decided to do what I did to her and teased gently before upping the intensity and then simultaneously fingering and licking Helen's pussy. Helen climaxed as expected and pulled Sarah towards and her kissed her.... suggesting they go to bed - together. Sarah sent me a brief message confirming my wildest thoughts and said that Helen had made her cum, and that she had made Helen cum! I was half suspicious hat I was being teased by a couple of fully clothed but tipsy girls who were just winding me up. I replied "yea yea" And Sarah told Helen that I didn't believe what she had just done! Helen then suggested that Sarah got back into position and licked her, before Helen took a photo on Sarah's phone and Whatsapped me! My eyes were on stalks when I saw the pic and a message saying "Hello Andy, this is Helen, we are having a lovely girlie evening and now we're going to bed!" I guessed which one of the group Helen was by her figure - her face was not visible but her lovey breasts were. I lay in bed with a rock hard cock imagining what they were doing - I had my thoughts confirmed the following morning when Sarah whatsapped and I asked her for all the details.... she said she felt a bit fragile, Helen was making them tea and toast, and that she had indeed spent the night with Helen, they were both naked and had touched each other a lot, and also used Helen's glass dildo and Sarah's little lipstick vibrator. I asked if she was ok with what had happened and she replied "I just seem to be getting worse!" with a smiley face and a kiss . I teased that this meant she was bisexual, and she said she was 80% straight but that Helen had made her very wet and horny!