Good story and it is all true

A few years back I was with a girl that was horny all of the time. We were very attracted to each other and liked to talk dirty whenever we fucked. Sometimes we'd talk about having a threesome, and once or twice we actually posted some ads looking for a girl in one of those permisteral pages. We didn't find much, and what we found didn't go too far.
We would keep talking/fantasizing about having another man in bed with us but just left it at fantasy.
Once when hanging out with a buddy of mine she blirted out "can we have a threesome?"
I was kind of embaressed so I just blew off the idea and my buddy did egg it on, but nothing happened.
She mentioned this a couple of other times but again, nothing happened.
Flash forward maybe several weeks, and someone at some point said 'ok'.
We drove to a motel, one of those 'theme' room motels. Roman columns, overdun window treatments, hot tub, the whole shebang.
She was brazen so it didn't take much. My buddy was getting a free lay so he was ready to go.
She lost her jeans and got on the bed. He was eager so he started teasing her with his tongue through her panties. She always wore hot panties and these were red thongs.
After a while she started to wiggle around from his tongue action. I don't remember at what point she lost her panties.
I don't remember who entered her first. But we tried the blowjob and from behind pose. Porn Movies make it look much easier then it is.
That's right, she was using her mouth on him, and i was behind her. This is tricky because it's kind of hard to keep a rythm going.
Admittedly I started to get damn excited. As soon as I came I got a little jealous, because she didn't stop going down on him.
Still not really knowing what to do next, I just relaxed on my back, laying right next to her.
He entered her while she was on her back, and she held my hand.
She was getting hornier with each thrust, and then looked at me and said "I love you".
He finished, on her I guess, we weren't using condoms.
The next time I hung out with my bud he said he felt bad, but I assured him it was ok.
This is part 1

[b]The next time I fucked my girlfriend was hot beyond belief. I kept asking her[b] how it felt to have my buddy in her, etc. I asked if he was bigger and she wouldn't tell me, so I told her, "just say yes when I ask". She did.
She asked if we could do it again and I replied 'yes'.
Not too many weeks later we were all hanging out and decided to get another room. And of all things to argue about, it was who would pay for the room. I told my buddy he was getting the free lay so it was on him.
We settled in and I have to tell you, I don't remember how it started this time. I do remember we were at Motel6. My girl had a cold and was very hoarse when speaking.
We fucked for a little while, I don't think my buddy did much at that point, other than make jokes (he was 'on' all the time). I came quickly, and he got on her and entered her, making her moan. He fucked her harder than the first time. I will never forget her moans, in that hoarse voice.
I was very jealous this time as I had finished and was left there watching. I had to go outside to take a breath of air, and came back to them still fucking. She felt a little bad this time.
He said something like, "sorry, I slipped", and got off the bed and used the bathroom. I didn't know if he meant he finished too soon, or if he meant he had come inside her.
We left and gave it a rest for a while.
This is part 2

After fucking a few times we started to talk more and more about the details of our escapades. We started to discuss or fantasize about letting her meet my buddy without me there.
Nothing came of it after a lot of talking dirty.
One night I was fucking hornier than hell, and left a note for her to come home to. I wrote simply, "why don't you pick a night to go fuck _____ and not tell me, then bring it up the next time the two of us fuck".
Well, I woke up to her playing with my cock. We started doing it after a while, and she told me she read my note and went and fucked him. She told me they did it in her car near his house.
I was pissed but this was in the middle of sex, so I didn't care.
There was still the chance she was just trying to get me horny, like I intended with my note.
Well, this was the next day mind you.
I happened to walk by her car, while on my way to mine, and I noticed her car in a different parking spot then the previous night, and I look inside (I had to), and saw her black bra laying on the passenger seat.
This is part 3

I actually was pissed for quite some time after she went and fucked him but she was right, I asked her to. I ultimately apologized for being nasty to her about it.
Ok, flash back like 10 years earlier, my first girlfriend. I slept over, in her basement. Her friend, a hot blonde slept over too.
We all slept in the basement where her parents thought they could 'monitor' us.
Well we were fucking before you knew it, and get this, as we're fucking, she is slapping her friend, shaking her shoulders, and trying to get her to wake up. I'll tell you, I don't know if she was pretending to relax or what, but she was out! (earlier in the evening she stepped over me with short shorts on as I lay on the floor). The fantasy was playing out in my head for sure.
Anyway, something like a few months later, we were at my house, and we used to have to fuck on the couch with blankets over us. Girls weren't allowed in my room. My buddy stopped by, and was watching TV, and I was sliding in and out of her real slow. She said, "_____, come over here", he did, she asked him to get close, and while I was inside her, she kissed him on his lips.
I don't know why, but that got me hot then and it gets me hot now to this day!
This is part 4

Flash forward to the present, or more accurately several years ago. We had a few more threesomes, but mostly, my girlfriend would go meet up with my buddy and just fuck him. She would come home and tell me how they took showers together. I almost had to beg for the info., but she admitted she let him fuck her in her ass.
After a while, I would get so horny while fucking her and listening to her tell me how he pleased her, that she started calling me his name while we fucked. She would say, "______ fuck me, fuck me like _____ doesn't know how."
This went on for months I guess until my buddy got a girlfriend of his own, and that was the end of that.
I had a good video of him fucking her in our apartment but i destroyed it. It turns out she met a guy I had no knowledge of and fucked him. I considered that a break in trust and although we did try, we couldn't work out relationship out.
Still, we fucked for some time while broken up.
Flash to present day and I am with a serious girlfriend. We haven't and probably will not have a threesome, but we have fantasized about it lightly. What I love most is when we are fucking, and I put my finger in her mouth, and she sucks it like she is sucking a cock. We don't say anything to each other, but we both know what she is really 'doing'.
This is part 5

I should mention that my buddy got heavy into some cocaine use at one point. I'm not into that garbage. But once when we were having a threesome he wanted to use his mouth on me and I let him. I didn't get anything out of it, which surprised me, as I thought a tongue is a tongue. This was the first time I was involved in anything like that.
Later on, when the threesomes stopped, he came over, and I don't know what the hell we were thinking, but with my girl in the living room, we went in the bedroom and went down on each other. I actually got pretty hot, but more so from sucking him, and so horny in fact, I asked if he wanted to put it in my ass. He did and I let him. He was thrusting hard, it didn't hurt I guess because I used a lot of lube. He tried reaching around to jerk me off but couldn't do much to please me. My cock was hard, and he asked, after thrusting in me for 5 minutes, if it was ok for him to come, I said yes, and he released inside me. The thing I remember is that there was a puddle of cum on the sheet just below my cock, it seeped out. He tried to get me to cum by sucking my cock but couldn't.
I shared the details with my girlfriend the next time we fucked.
This is part 6

During that stage of my life I had the most experimental sex I most likely will ever have. I don't know how many people do it and never talk about it.
I love my girlfriend of present, and wonder why now, even as much as I love her, I would still love to see her fucking or at least blowing another man. Any answers?