"Is this dirty little slut on the pill?"

Geoff was looking at me as he asked the question, slowing his deep, hard thrusting between Julie's widespread thighs. His face was red and sweaty.

But before I could reply, Julie answered. It was the first thing she'd said since he'd first begun fucking her - apart from the quick panting moans she'd made each time he buried his thick hard cock in her well-pounded pussy.

"Cum in me, you bastard!" She grabbed his head, twisting it so she could stare into his eyes. "Just fuck me. Fuck me and cum in me!"

This happened over 20 years ago, but to this day it still makes me hard thinking about. It was a night of many firsts: My first experience of swinging. My first time screwing another man's wife. And the first time I'd watch my girlfriend - Julie - being fucked hard by another man.

Oh yeah, and it was the first time I got to fuck a pussy that was full of someone else's fresh hot cum.

To fill in the back story. This all happened on the last night of a holiday we had, in a shared cabin in the mountains, with Julie' friend Karen and her husband Geoff. Well, when I say Karen was a friend, she was actually more of a work colleague - and Karen was the main source of scandal and gossip in the office where they both worked. I'd never met her before we all went away together, but I'd heard all the stories of how she was supposedly having an affair with one boss or another, at the same time as flirting with all the male clients.

Karen was about 10 years older than Julie and Geoff was a couple of years older still - maybe 32. This made him and Karen seem like real grownups to me and Julie; I was 20 at the time and she was 19.

Karen and Geoff came to pick us up on the day left for the cabin, and that's when I first met the infamous Karen. She was quite tall, with dirty blonde hair tied back in a loose ponytail, and was wearing a clinging white tee shirt and tight jeans that showed off her trim athletic figure - medium-sized perky tits, slim waist, firm tight buns and long shapely legs.

Geoff seemed very much a what-you-see-is-what-you-get-sort of guy. Like Karen, he was tall and in good shape, but all he seemed interested in was cars, women and football. If Karen was sleeping with some of the managers, it was probably because she wanted more sophistication than she got at home. And there was no way you could call Geoff sophisticated - when he first met Julie, his eyes were fixed firmly on her tits not her face.

Not that I could blame him. Julie had a nice rack - big and firm and bouncy. She was self-conscious about them and always wore baggy tee shirts to hide their size, but this often made it worse - when she moved, they would too, just like the proverbial 'two puppies fighting in a sack'. Julie was medium height - a few inches shorter than Karen - and just at the right age to get away with carrying a bit of extra weight. What I mean is, she had big tits and a big sexy ass to balance them, but she still looked shapely and fuckable. She had shoulder length wavy black hair and yes, 'the carpet matched the curtains' - this was before shaven pussies became all the rage, and Julie's tight little snatch was framed with a nicely trimmed patch of curly black hair.

Julie and I had been dating for about a year at the time, and we'd been having sex regularly in my car or at her parents whenever they were out. One thing about Julie, she loved having her tits squeezed while fucking. When she was on top, she'd often put her hands on her head so her breasts would thrust out more as I mauled her soft flesh and twisted her nipples. She never really talked dirty, though, other than to sometimes say, "Harder". But she seemed to get especially turned on when I left her tits all red and tender.  

Anyway. The four of us were booked into the cabin for five nights, and every day we'd got something planned - hiking or renting bikes, or going sightseeing or shopping in one of the nearby towns. Sometimes we went with Karen and Geoff, especially if we needed a car, and sometimes it was just me and Julie. At night, we all took turns making a meal then just relaxed watching tv. What with all the fresh air, we hit the hay quite early - and, with it being still a novelty to have a room to ourselves as a couple, we fucked every night. And Geoff and Karen did also; although the cabin walls were pretty thick, we could often hear a regular banging noise coming from their room or, better still, Karen moaning while Geoff was obviously giving her a good hard pounding.

Although she didn't say anything, listening to the other two fucking seemed to get Julie turned - on (it sure as hell did me!), and she was always more eager for a good hard fuck herself whenever it happened.

But other than that, everything was quite normal day-to-day. Sure, Geoff was always leering at Julie's tits, but nothing too over the top. At first, Julie seemed a bit put off by this, but after a few days she seemed to appreciate the attention she was getting. At any rate, on the last night, she appeared to be egging him on, even brushing her breasts against his shoulder when he was sitting down at the table and she was reaching past him for something. She did this a couple of times, even though she could easily have avoided the physical contact. Even I noticed, and I'm not the fastest on the uptake when it comes to women - and I know Karen noticed, too, because she started watching Julie with a faint smile on her face.

And why wasn't I upset about this? For two reasons: first because, at one point in the evening, Julie and I were in our room looking for something, and she suddenly came up close and began kissing me while grabbing at my cock through my jeans. I was instantly hard - and got even harder when she whispered, "Are you gonna fuck me on out last night?"

Fuck yeah! I thought.

So that was one reason I wasn't too bothered about her brushing her tits against Geoff. The other reason was that I was nice and mellow from the alcohol weâ'd been drinking - and I think that's why Julie had loosened up so much also. Neither of us were big drinkers, but, as it was our last night together, Geoff and Karen had bought some liquor, and even quite early in the evening I was feeling no pain.

Anyway, because I was nice and chilled, I'd sort of zoned out of the conversation, and was sitting back thinking about fucking Julie later (and maybe, if we were lucky, hearing Geoff and Karen doing the same. The suddenly Karen was dragging Julie out of the room, giggling - and Julie was sort of half protesting but laughing also, and allowing herself to be pulled along.

I looked at Geoff, confused. He had a big goofy grin on his face, and when he caught my eye, he winked. "Karen's planning something," he said, and his grin widened, "and I think us boys are gonna like it."

Ten or so minutes later, by which time me and Geoff had cracked open another beer, Karen came striding back in, again dragging Julie by the hand. This time they weren't laughing: Karen looked sort of determined and Julie looked kind of - I don't know - shy or embarrassed.

Before I could ask what was going on, Karen had let go of Julie and plunked herself down next to me on the couch I was sitting at.

"Notice anything different?" she said, looking me straight in the eye.

The room went quiet. I looked at Julie. She was standing there awkwardly, looking at the ground. Then I looked at Geoff. He was grinning even more, staring at Julie - or rather, staring at the obvious bump of her tits underneath her baggy tee-shirt.

Finally, I turned back to Karen, who was sitting really close. I was just opening my mouth to admit I couldn't see anything different, when she took a deep breath - and as her chest rose, it suddenly hit me. She wasn't wearing a bra! It was so obvious once I realised - the contours of her perky tits were clear as day in her tight clingy white tee-shirt, and her hard nipples looked like they were poking holes in the fabric. How I hadn't noticed when she'd walked back into the room, I don't know.

"Do you wanna feel them?" Karen asked, thrusting her tits up even more. She rested a hand on my thigh and my cock instantly grew hard.

But I was confused. Karen was Geoff's wife. I quickly looked over at the other two. Geoff was already standing behind Julie, both hands around her waist. Julie, though, hadn't moved. She was just staring at me and Karen.

I felt Karen's hand move off my thigh. I looked back at her, and she was already pulling her tee-shirt over her head. Her tits bounced into sight and they were beautiful - small but ripe and firm. And those nipples! Big and hard and dark against the paleness of her naked chest.

"Go on, you can feel them," she purred, reaching over to grab my hand. She pulled it up towards her chest so that my palm was suddenly cupping one of her firm juicy tits. Then she smiled and looked towards Geoff and Julie. Her smile widened.

I followed her gaze. Geoff now had both hands under Julie's tee-shirt, reaching up and squeezing two other juicy ripe tits. And Julie was just standing stock still letting him, her eyes now closed.

To be continued.