I was watching some porn cast to my TV from my laptop. I was slowly wanking to the action on screen when my girlfriend walked in, and worse still she had a friend with her. I had the choice of covering up or kill the TV. I tried to do both and failed at both. Both Maddy and her friend Coleen saw my cock before a managed to cover it with a cushion ant the porn was still playing having grabbed the wrong keypad. I wasn't sure what reaction and fallout there would be. Instead both the girls sat on the sofa and watched the action on screen in silence. I tried to secretly finish putting my cock away from behind the cushion. It wasn't easy as I was still partially hard, but I eventually managed. The action on screen was of two girls and a young man. He was fucking the one girl whilst the other sat on the first girls face. As the screen shots changed we had views of the girls tongue in her friends pussy and shots of the cock pumping in and out. Then the man came all over the girls mound. I managed to stop the action on the laptop and the final shot was frozen on the TV screen. Coleen was the first to speak, "Do you really like that stuff?" she asked and I told her that I did. Maddy joined in, "You like lesbian scenes?" Again I told her that I did and that I liked lots of other action as well. Maddy wanted to know what sort of other action. I decided to come clean and be honest even if it lost me my girlfriend. I told them I liked lots of things from Older women and younger men, Sharing girlfriends with others and group sex scenes. The both insisted that I showed them. It took just a few minutes to find a clip of a woman in her forties riding a lad that looked barely old enough. As the clip played Maddie asked was I imagining that I was the young man. I told her I was. Then when the clip finished Coleen wanted to see a shared girlfriend. The clip I found was lad that allowed a mate to fuck his girlfriend and then he had sloppy seconds. Coleen wanted to know if I would be the man fucking his mates girlfriend or the one getting sloppy seconds. I told her I liked both scenarios. Maddie wanted to see some group sex. I found and played a clip of about six or seven couples fucking and swapping partners. Coleen then asked could she see some with big cocks. I found some and Coleen picked one with two black men and a small white girl. I heard gasps from both of them when the first man slammed his massive cock into the girls pussy and the other tried to get his into the girls mouth. They both wanted more when the clip ended. I found another then another and again. In fact I even went to bed leaving the pair of them watching porn. It was some time later when I was dozing that she came in the room and was playing with my cock under the duvet. I of course expected it to be Maddy as she was my girlfriend. Then she was under the duvet sucking my cock deep into her mouth. It then dawned on me that either Maddy had taken inspiration from the clips or it wasn't Maddy that was sucking my cock. Maddy up till now would barely let me get more than two inches into her mouth and at the moment my cock was almost fully into the mouth sucking me. Then the lights went on. "You slut, I guessed that was where you had gone. That's my boyfriend you are sucking," Maddy shrieked. Coleen with mouth still full acknowledged that I was Maddy's boyfriend, but claimed she couldn't help it and was desperate. My cock was at full mast and at that moment didn't really care who was sucking it just so long as they didn't stop. Then Maddy was also under the duvet snatching my cock from her and sucking her usual two inches into her mouth. I was about to complain when Coleen told her she was doing it all wrong and snatched it back and almost all of it was back in her mouth. They started to compete as my cock was moved from mouth to mouth. Maddy was trying to compete and was now getting quite a bit more in her mouth. Coleen was now taking up to my balls and even licking them at the same time. Then I came in Maddy's mouth as she tried to compete. Up till now she had always forbid me from coming in her mouth, but it was too late. She want to say something which I expected to be a complaint and ended up swallowing it all instead. I was obviously satisfied if only for a while but neither girl got any satisfaction from sucking me. Maddy tried to assert her ownership insisted I lick her out. As I climbed between Maddy's legs and removed her panties I see Coleen remove her own. As I started to lick Maddy's pussy I watched Coleen fingering her own. After a few minutes I swapped to Coleen's pussy and started to lick her. Maddy was protesting and I watched as she started to rub her own pussy. I swapped pussies a few more times. Then to both their annoyance I stopped licking either. I now had them both complaining. I suggested that if they wanted their pussies licking they would have to lick each other. Coleen was quickly on top of Maddy and licking Maddy's pussy. Maddy was a little less enthusiastic and it took a little while before she tentatively licked Coleen's pussy. It wasn't long before they were both seriously tonging each other. The sight soon had me rock hard again. I moved behind Coleen, whose arse was in the air and slipped straight in. I could hear Maddy grumble as my balls slapped her face. I suggested that as well as licking Coleen she could lick my balls. Again reluctantly she did. Then I pulled out and went round to Maddy's pussy. Coleen looked up as I slipped effortlessly in. Then she went back to sucking Coleen's clit and my cock. I swapped back a few more times before asking who wanted my load. They both said they wanted it. I took the decision and pointed out that Maddy had already had plenty of my loads, so I dumped it deep into Coleen's pussy. They continued sucking each other for quite some time. I just sat on the side of the bed and watched. Afterwards we all cuddled up in bed with me in the middle. "So that's what you fantasize about when you watch that porn?" Maddy asked. I told her that it was one of many fantasies. Then she told me that two big black cocks was now one of hers. Coleen quickly agreed with her. I pointed out that I had two more years at Uni so we had plenty of time to act them out. Over those two years we tried most of the original ones and a few more besides. I ended up marrying Coleen the year after that and now a further six years later we have two children. Up until the Covid epidemic Coleen and I were still trying different situations and on rare occasions Maddy and her husband would join us for some fun.