'Well that is a lovely sight,' he commented. 'I'll sit back and enjoy the show if you don't mind.' She was clearly a woman who enjoyed sucking cock, teasing the tip with her tongue, before taking it deep, lips locked around my shaft. Enjoying myself so I much, it took me a while to realise that at some moment while she was sucking my glans another tongue had begun to lick my shaft.It wasn't until she sat up (while the cock sucking continued) that I realised what was happpening. 'Are you enjoying that?' she laughed. Oh God. It felt so naughty, so erotic. Never before had I even considered such an experience, but in the heat of the moment I didn't really care. This gorgeous woman sitting on my face, while her and her husband's mouths and tongues shared my cock. The two of them continued sucking my cock and licking my shaft and balls until before long, I felt myself go beyond the point of no return and shot my load over them both. This was driving Jo wild as well as she soon screamed her way to an orgasm, soaking me further before we all ended up lying in a spent, hot,heap on the bed. 'So that's what you meant by blurring the lines?' I said after a while. With this, they began talking about how much they enjoyed experiences where everyone could be open, how liberating it was when pleasure could be given and received freely, and how much it turned them on to do this. Before long, I could feel myself getting hot again and began kissing Jo who gently took both my and Mike's cock in her hands. Watching her do this soon got me nice and hard again. I told them I'd never experienced such a moment with a couple before. 'Well, now that you have, is there anything else that you'd like to try?' she asked. As she continued stroking our two cocks back to life, I remembered something I'd once seen in a porn film. 'Well...' I said. 'Don't be shy,' replied Jo. 'Mike looks like he's ready for action so why don't you ride his cock. I'll just sit back and watch for a while.' 'Is that it?' asked Jo. 'Not quite,' I said, smiling. Jo straddled Mike's cock in reverse cow girl, while I sat at the end of the bed watching her slide up and down on him, her hands cupping her breasts. I sat back slowly stroking my cock smiling at her and telling her how sexy she is as she waited to see what I'd do next. I walked over to her and started kissing her again while gently stroking her breasts and nipples before taking my cock in hand and teasing both her nipples with my already moist tip.With this, her kisses intensified. Next, my mouth moved to her neck, shoulders and down her chest. Cupping her breasts, I took one in my mouth, my tongue flicking her erect nipple, as I tasted my own juices on her, and causing her to moan a little more. From one to the other, I licked and sucked her beautiful nipples and large areolas. After some time, as she continued to ride Mike slowly, I pushed her back towards him and move my kisses down to her belly. Sensing where I was going she let out a little sigh of 'oh yes'. Further down I went until my mouth was so close to her pussy and Mike's hard cock thrusting inside her. As my tongue flicked her clit, she moaned louder. This was such a turn on for me and soon the sheer excitement took over and I began licking both her pussy and his shaft as it slid in and out. Both he and she were moaning now and the taste of their combined juices and knowing how much pleasure I was giving to both of them was out of this world. The energy was incredible and soon she was racing towards another orgasm. I tried and keep licking at her clit but as Mike pumped harder it became more difficult, especially when her whole body shuddered as she came and came. Lying back on the bed to catch her breath with both of us now either side now, kissing and stroking her, I could sense she wasn't finished with us yet. And with both of us still hard I know there was more to come. Jo turned over on to all fours offering her beautiful arse. I moved towards her and began kissing and licking her. It was too much. 'I want your cock,' she told me. I turned round to find and roll on a condom, and when I turned back, Mike had assumed position underneath her in a 69, eagerly licking her pussy. I approached them and he grabbed my cock and started to tease Jo's pussy with it, before guiding it in, leaving me to thrust. As I fucked Jo, she sucked Mike's cock. As I continued, I could sense his tongue on my shaft and licking my balls. Each of us was being driven wild by the other two, and in the heady blurry moments that followed I really understood what it meant to share and be shared by a couple and it just seemed so natural to just enjoy it and go with the flow. As I continued fucking Jo from behind, I started necking her, licking the sweat from her neck and shoulder before brushing her hair out the way so I could nibble her ear. At this point I must have slipped out of her pussy, as I could feel Mike take my cock and rub it up and down her slit and then towards her tight arse. As he teased her here with my cock, she began to moan louder, before gasping 'Oh God, fuck my arse.' Well, it was an instruction I certainly couldn't ignore. I gently and slowly pushed the tip of my cock into her, and with each push went a little deeper until she'd taken my whole length. She was so tight. It felt amazing. 'You like my tight little arse, don't you?' so cried. 'Oh yes,' was all I could manage by way of reply. With this I moved my head next to hers, desperate to kiss her. As she turned her head our tongues met. It took me a moment to realise what that salty taste was in her mouth, but she took my obvious pleasure as a cue to guide Mike's cock between our tongues. It was so erotic. Together, we kissed each other with a new abandon while sharing his cock, while fucking. The moment was short-lived, as soon I was unable to hold on any longer and lifted my head and arched my neck as I came inside her. Rolling on to the bed next to them I watched as they both finished each other off with such intensity. Lying there for a while, as we all caught our breath, there was little that needed to be said. But later on, we talked more over another glass of wine and all agreed what an amazing evening it had been. I told them it was one of the naughtiest times I'd ever had. Jo asked me if I would have accepted their invitation if I had known about their bi-playfulness. It was hard to say, but that in the heat of the moment, pushing these boundaries had been so exciting and pleasurable. They told me how liberating they found such play and we all agreed that sexuality was something to be explored and enjoyed rather than defined.