Ok, here's one of my/our earliest MMF situations that turned out to be mind-blowing...
Dan and I were dating and, as I think I said, we MET swinging. So, me being naughty, I was still seeing a guy or two - and because we were still pretty casual, I didn't feel the need to get Danny involved every time. One guy I loved was an old boyfriend, Bill. Bill is a biker and we have zero in common save for mind-blowing sex. He's 6'6" 240, a huge, hairy, bearded bear of a man with a massive, veined cock. I loved that about him and not much else. But Dan had pissed me off (ironically, this was right on New Year's eve some years ago... OMG...), so I had Bill come over the afternoon of New Year's Eve and we had ourselves a session. His giant frame, his sheer bulk and brawn, hairy, beardy, massive cock... grunted and pounded and covered me in seed all afternoon. But it's funny with Bill; he can only come by fucking my ass. So as much as I want to suck or vag fuck, I am allowed as much time as I like... then comes the ass-plowing and a massive load.
Anyhow, Dan was feeling bad and decided to secretly pay me a visit. He had flowers, champagne, wanted to make up. He got to my home and as he was walking up the path, heard noises, heard the great guttural grunt of the giant bear on me and my screams and cries from the sheer drilling I was getting at the hands of this beast. He told me later that he stood on the other side of my front door, listening for quite some time. His cock, he said, was aching. It was a completely new feeling for him and he hadn't ever considered that being cucked could be a massive turn-on. It never had come up. Danny's tool is large and lovely and the most beautiful cock you will ever - ever - see. Sculpted. He uses it very well, he's brilliant, and he uses his head to get inside a woman better than anyone I know.
And yet, there he was, hard-on aching, listening. He walked away (I learned all this later).
A week later, we were all good. While making love in my bed, me on top, he told me. I was shocked and scared he would be angry and I don't know what - caught, I suppose. Instead, as I bounced on his cock, he recounted the event for me from his side of the door that day. It got to be this huge turn-on for both of us. Then he did it: he asked me to call Bill and invite him over. So, astride my Danny, I dialed Bill and told him that Dan and I had made up but that we'd like to have him over, left it hanging... but Bill, being Bill, was coming for me in any case. It was that same evening Bill joined us.
I dressed in an all-black sexy negligee, black hose, black silk gloves up past my elbows. I served the men the champagne that Danny had initially brought (we just hadn't gotten to it). It was both sexy and funny to see the men, mouths agape, knowing what was going to happen but not exactly how and when. Big Burly Bill with his giant hands holding the champagne flute. Danny, who at 6'2" is not a small man, looking up at him - a little shocked, perhaps.
Dan arrived after Bill was already there, a little late. I had been merely teasing Bill, and Dan arrived out of breath from his place, finding parking, coming upstairs to my condo. Dan excused himself to go to the bathroom, whereupon (I didn't know until later), he nervously smoked half a joint.
It took a while and by about a minute in, Bill GRABBED me and put me on my knees in front of him as he sat on the sofa. I happily obliged, took his enormous cock out and began sucking and cooing - like I do. The next thing I know, I felt my dress being lifted from behind me, and Dan's perfect long fingers exploring me. I'd done three-ways before, but the anticipation and timing were just lovely. Finally, his mouth was on my pussy and ass. My hubby can really, really eat pussy and he loves to. He backed off. I heard buckles fumbling and clothes coming off and, all the while I worshipped Bill's massive tool, Danny finally slide in his lovely cock.
I was spit-roasted for a time, then spun around and spit-roasted the other way. Dan and Bill traded places and I got astride Dan on the sofa. Bill got behind me and we did our first double penetration of the night. Bill came first, hard, up in my ass, his seed dripping on Dan's balls as I squirmed. We went back and forth on each other all night. Dan and I in 69 with Bill doing me. Bill and I in 69 with Dan doing me.
Bill and Dan each came several times and then Bill left. Dan came once more after Bill left and we slept together in sperm and sweat and love all night to like 11 am the next day! We've had Bill over many times, but that first time was amazing. I've also had Bill and some of his friends at times when Danny was unavailable, out of town, etc. When I do that, I know it gets to Dan. I know it because when he gets home, he loves - and I mean LOVES - to "reclaim me."
We have, I think, the perfect Vixen and Stag relationship.
Your Kat.