It started by us watching porn together! I could always tell which cocks got her turned on by her increased breathing and her hands moving towards her smooth pussy. It turned me on watching her getting hot looking at other mens cocks. One night we were watching a particular raunchy movie and had both been drinking more than usual, which made us a lot less inhibited and freed up our chat on our fantasies. Itold her how it turned me on watching her getting excited and wet looking at mens cocks, which she replyed by saying "yes and I think that it excites you not just me getting wet looking, but you like the cocks too !" Which I freely admitted to ! Well from that first conversation we soon started to tell each other more of our secret fantasies.How she yearned to have her pussy filled by a really big cock, or to have a few men giving her it hard in all of her holes! I told her how I would like to see her with another man too, but was a bit worried that if she had a big one she might not want mine again. The next few weeks our chats continued along the same vein, but as time went on we included a few more fantasies that we hadn't spoke of before. I assumed it was just chat and she wouldn't ever actualy go through with them so I used to make up dirty senarios for fun.This proved to be rather foolhardy of me, which will become quite apparant when I tell you about the experiences that followed. One of her fantasies was to watch me suck another mans cock.I had told her that I would do it for her, but would feel more inclined to do it if I was in a submissive role, so I could excuse myself if I had regrets doing it as I wouldn't be the one in control! I was in the bath one friday night, when she shouted to me to hurry up as we had somebody visiting us."who is it" I asked. Unbeknown to me she had joined a swinging site.We had a couples membership and she had included many of our fantasies in our profile.She had included that I was submissive with a small cock and that she wanted a REAL man ! She also had ticked bi males box for people we were looking for. He turned up at our house about an hour after I had found out about her posting this profile .He was a friendly guy,fit body and not too shabby looking also.His name was John and was bi curious.We chatted for a bit about the weather etc before the G/F turned the conversation to sex. She told me how she had chatted to John a few times and he had wanked on cam for her,which took me by suprise but inwardly turned me on too. She had invited him because he told her how he was curious to have a man suck him off and he liked the idea of it happening in the presence of a lady. As the conversation continued I realised that my G/F had obviously been chatting to alot more men than John, as I was coming to terms with those thoughts my G/F told John to undo his trousers and get his cock out for me to see. To be continued