One night stand with friend's ex while they were 'on a break'. [MF]

So I found out last night that I had sex with my friend's boyfriend and inadvertently helped him cheat on her.

Let's call them Rebecca and Mark.

I've been friends with Rebecca since we lived together at university. We see each other socially a couple of times a month, either a coffee and chat or a night out with the girls. I'd learned recently that she was 'on a break' from her relationship with Mark, her boyfriend of a couple of years. Nothing salacious, just normal couple issues. They had been planning on moving in together soon but it was all on hold. I lent a sympathetic ear, as I would for any of the girls in my circle who were having this kind of issue.

A couple of weeks ago I was out with a different set of friends. It was a Saturday night and I was definitely 'tipsy'. We were out at a bar with a live band, having a good time. I was enjoying the attention of a couple of boys when I made eye contact from across the bar with Mark, out with a group of his mates. A brief smile and wave from each of us but then he kept glancing over. I was standing in line at the bar when he came over and we got chatting while we waited. I said I was sorry to hear about him and Rebecca and all the usual small talk. It was busy so we were there for a while and, honestly, I didn't realise he was so charming. I'd been totally neutral on him previously but he was so funny and unassuming we were laughing a lot. Once served, we found a standing table and continued our conversation.

It got a little flirty. There were some arm strokes and his hand touched my side briefly then he leaned in and kissed me. I was a little shocked at first so was slow to react but it was a good kiss, unrushed and gentle. I was immediately turned on, feeling the familiar twinge down below and my face flush. We stood there for a while, holding each other and just kissing. When we broke off, I noticed my friends were busy with a couple of guys at the other end of the bar so caught their attention and made a signal at them to let them know I'd met someone and was going home. We always check in on each other so I knew they wouldn't be too worried.

I took Mark's hand and led him outside. It was a bit of a wait for a taxi but he kept me close, holding me and kissing me so I didn't notice the cold. I did notice the bulge in his trousers though!

We went back to mine and, once through the door, it was on. The kissing got a lot more urgent and his hands were at the zip at the back of my dress in no time. It dropped to the flor and I was soon standing in my hallway in just my knickers, bra and shoes with his hands brushing all over my skin. i led him through to my bedroom and started to strip him. He actually had a lovely body, athletic but not ripped. I ran my hands through the light hair on his chest and moved to lick his nipples. A groan filled the room. I kept kissing, getting down onto my knees and undoing his trousers. His cock popped out and it was stunning. Perfectly smooth, a sensible length and girth and lovely dark trimmed hair at the base.

I spent the next 10 or so minutes licking and sucking his dick and balls. I couldn't believe how loud he was. A couple of times when I was in full flow taking him deep into my mouth he pulled back or asked me to slow down so he didn't cum. I appreciated the resilience but would also have been happy to take a first load in my mouth. I had a feeling there'd be more than one orgasm tonight. Still, he held off and asked me to take the rest of my underwear off and lie on the bed. It was his turn to get on his knees and push his face into my pussy, alternating between lapping at my entrance to sucking my clit.

I came really fucking hard and was so ready for him to be inside me.

After a quick break to put a condom of, he was on top of me, pinning me down to the bed with his dick slipping easily in and out of me. It hit the spot straight away and had me moaning loudly. He pushed himself up into a push up position and I looked down to a fantastic view of his pristine cock going in and out of me, allowing me to both see and feel every single stroke.

We didn't change position, just went at it like that for a while until he inevitably came, his moans managing somehow to be even louder than mine.

We cuddled for a while and did get to chatting about Rebecca. How tough it had been, how he needed a release. They weren't together (or so I thought) so I didn't feel too guilty, though I was determined she wouldn't find out so as to not make things weird between us.

I could tell when he was ready again by his hands working between my legs. This time around he really took his time and spent ages sucking on my tits as he gently rubbed me, tipping me into another orgasm. After, he had me bent over on all fours and, having had that first orgasm, his staying power had significantly improved. I can only describe it as him going to town on me, hearing our skin slap together and feeling his full length inside me was amazing. I'm not usually a fan of bum play but his finger was toying with me, tentatively at first, before he pushed it in. The full feeling I got was amazing and I let him know, dirty talking and pushing back on his dick as he pushed into me. We were a loud sweaty mess when we both eventually came.

After a few hours sleep, we got frisky again in the morning. I was actually up and dressed eating cereal when he walked in to the kitchen naked. His cock was almost full length even though it was flaccid and it just did something to me. I had to stop what I'd been doing to stroke him hard before getting on my knees to finally tease a load out of him and into my mouth. I unbuttoned the loose shirt I was wearing so he could see my tits. He'd been a big fan in the dark when we were having sex so I didn't mind him having a good look now. Just as he was about to cum he pulled out and sprayed all over my chest. I really do mean all over as well. Having cum twice the night before, I was amazed he had it in him. I didn't mind but was hoping to swallow him so gave him a friendly telling off as I was cleaning up.

After he left, we continued talking a few times a day. Work has been really busy so I hadn't been able to invite him over but it was definitely on the agenda. It was a bit of a surprise when I saw Rebecca randomly in town yesterday and found out, over an impromptu coffee, that she and Mark had been 'patching things up' and, with some subtle questioning, that they were very much involved again on the night he came home with me.

I'm not really looking for advice or judgement, just wanted to share the story. I am a bit frustrated at what he did, doubly so because the sex was so good I wouldn't have minded a little bit more. I've found myself thinking about him (and wondering what him and Rebecca are like in bed together, which is a whole other level of unexpected...) when I touch myself recently. There is no chance I am initiating a threesome before anyone suggests it either! Hopefully they can make it work and in the meantime I''ll just chalk this one up to experience.