Hey folks - first time posting here, though I have a few hotpast stories posted and some folks might have heard parts of this one before. This is a story from a few years ago, when I was still in my first major relationship out of high school. It was almost a decade ago so while I have tried to remember full details, I’ve probably embellished a few details in my own mind over the years. Full disclosure, if the title hasn’t given it away - this story has bi elements to it. This is also not a short story, so strap in.

A bit of info about us; At the time we were both 20 and had been dating since we were about 16. My girlfriend, fake name Julia, had frankly grown to be significantly out of my league but we had been together so long it “made sense”. Julia was about 5’5”, slim, incredible 34C tits and a great ass. She had her hair cut into a short bob that was always rotating through a series of different colours.

About a year prior to this, we had opened our relationship. We had been together through our formative years and decided we wanted to explore a bit despite still loving each other. We both did some experimenting, but a trend quickly emerged where she was having pretty lackluster hookups and ended up with one guy and one girl she was regularly seeing, and I was sleeping around fairly regularly. During this time she straight up admitted to being a bit of a size queen and that many of the guys she had randomly hooked up with were disappointing and “all talk”. On more than one occasion she’d leave after a hookup and immediately text me saying “Are you at home? I need to get fucked by a real dick.”

We had a mutual friend, fake name Mike. Mike and I had been friends since high school a few years before Julia and I started dating. He had made a few drunken comments about her over the years but it never led to anything. Mike was taller than me, about 6”2, with a slim to athletic build and long curly blonde hair - very “surfer” type even though we lived nowhere near an ocean. Never had a problem getting women and often bragged about it.

Mike and I end up at a mutual friends birthday one night and both get entirely too hammered. I offered him my couch since he didn’t live in the city, and we both completely struck out at the bar so headed back to my place. We crack a couple beers, light up a joint and just start shooting the shit. It comes up that Julia and I are in an open relationship and he cracks a joke about how lucky I am for getting to fuck her and other girls. We chat about it a little bit, him asking about my prospects etc and eventually asks if I get jealous about Julia sleeping around. I end up telling him that it doesn’t really bother me, but that she’s also “picky” and doesn’t find many guys that fit her criteria. He asks a bit more about that and I end up telling him that she’s a bit of a size queen. Mike pokes a bit of fun to the degree of “Oh, what, so you’re packing then?” and I tell him the truth - I’m going alright in that department. There’s a bit of a silence before he says “Well, if that’s the only requirement, I’m pretty sure I’m gonna finally fuck your girlfriend.”

Now, I try to laugh it off but I’m immediately at full mast after he says this and wearing joggers so its not at all subtle. I lean back and point and tell him “It’s a pretty high bar, so good luck”. He looks down and laughs and says “Yeah, I’m definitely gonna fuck your girlfriend.”
Now I’m pretty drunk along with that false confidence it comes with, high, incredibly turned on and know for a fact Mike is bi as well. I also know I’m bigger than most guys so its worth a gamble when I say “Yeah right - if you got me beat, you can fuck her AND I’ll suck it myself.”

He pauses for a moment, looks at me trying to figure out if I’m serious, then says “Sounds great”, stands up, and drops his pants. Out flops the longest cock I have ever seen in my life. He’s not thicker than me, maybe not even as thick, but looked like he had at minimum an inch on me. I’m sitting there with my mouth open, absolutely stunned about what’s happening, for who knows how long when he points to his cock and says “Well?”

I am a man of my word, so I snap myself out of it and wordlessly get on my knees in front of him. I take his dick in my hand, put another on it, then - staring up a bit awestruck - take the first hand off and put it above the second and still haven’t covered the whole thing. I start running my tongue up and down the entirety of it, taking my time to trace the incredible length and swirl around the head. Mike gets tired of my teasing and grabs unexpectedly grabs the back of my head, pushing most of his cock directly into my throat. I looses up a bit and get the last couple inches in, bobbing my head while deep throating him, feeling how insanely deep down my throat he was. As I’ve got every inch of him inside me he looks down and says “Damn, where’d you learn to suck dick like this?” And, before I can respond, tightens his grip on my head and starts to thoroughly fuck my throat.

I manage to pull back after a couple minutes, absolutely gasping for air. Mike’s just laughing above me and tells me “I can’t wait to find out if your or your girl suck dick better.” and then going right back to it. He is rough the whole time, completely using me, and I am rock hard and close to cumming myself between what’s going on and knowing he’s doing to do the same to my girlfriend. Just as I’m feeling like I’m about to cum without even touching myself, Mike explodes down my throat, shooting rope after rope of cum directly down. I reach down and squeeze my cock out of reflex and immediately cum in my pants. He only lets me go after every last drop is inside me, and immediately collapses back onto the couch, still with his pants off, and barely lasts a minute before falling asleep. I get up and get cleaned up and head to my room.

At some point the next morning, Julia gets home and comes and wakes me up. She tells me Mikes still passed out on the couch and everything starts coming back to me. I start to ask “Is he, uh-“ and she finishes “Naked? Yes.” while raising an eyebrow at me. I’m still fighting through the hangover haze as I am getting out of bed so I just tell her “Yeah, we fooled around a bit I guess.” and she laughs, is quiet for a moment, then says “Well, at least he’s hung.” I peak my head out the door and see him laying there, soft, and tell her “Oh - it gets a lot bigger than that.”, she opens her mouth as if to say something, then just lets out a “Huh. Noted.” and we largely both move on with our days. I head to work, and don’t see Mike again until the next weekend.

There’s a film fest in town so our favourite venue has a late last call and we all head over there for the night to dance and get drunk. Mike and I don’t really talk about what happened, just enjoy the night. Julia is there as well and wearing one of her more rare slutty outfits, so I know she’s looking to hook up tonight either with me or someone else. She’s wearing a black mesh top that has embroidered skeleton hands over her nipples, but no bra, so her tits are basically out, paired with black short shorts and sheer leggings. The night goes great, but we’re all drinking like we soon a normal night and have a whole extra two hours to throw them back so we all ended up absolutely trashed. Most of the night after midnight’s a blur, but I know we left Mike chasing some girl at the club and went home and I immediately passed out.

I woke up in a haze a few hours later barely aware of where I even am. I hear some voices and at first I just assume I crashed on a friends couch with other people or something, but as my eyes adjust to the light I realise I am in my room. I roll over to check if Julia’s awake on the phone or something but instead I come face to face with Mike. I’m confused as hell and can’t get any words out and he just says “Figured this was cool, given the bet” and nods his head down.

I look down and there’s Julia laying between Mike’s legs, stripped down to just her thong, bobbing her head on Mike’s cock. In her hands it looks even bigger and he keeps wrapping his legs around her head, shoving it down, causing her makeup to run down her face. I can’t believe she’s fitting it all. She manages to break free and come up for air for a moment and makes eye contact with me as if to ask if its okay - I just give her a thumbs up as I’m still in disbelief.

She goes back to licking his cock but he treats her the same way he treated me - grabbing her head and shoving it down, using her throat, getting every inch inside of her. I shuffle away from them a bit and take my own cock out, stroking to the sight of it.

Mike sees this and tells me to wait and that he’s at least going to give me a good show. He grabs a handful of Julia’s hair and throws her on the bed next to me, and grabs both of her calves hoisting her legs up in the air, almost folding her in half. Flopping his cock on her, it looks like it’s going to literally rearrange her organs with how far up her torso it goes. He doesn’t even hesitate to put it in and while she protests a bit, he’s balls deep inside her within a few minutes and she’s moaning as loud as I have ever heard her moan. Every time in awhile she looks over at me stroking my dick next to her, maybe gives me a pity stroke or two, then goes back to enjoying getting railed by Mike’s cock. He fucks her like this for what feels like an hour, keeping pace, stroking every single inch inside of her. Eventually he wraps both hands around her neck and begins to fuck her hard and fast for a few minutes before convulsing on top of her as they both cum nearly at the same time, him shooting what I know from experience is a massive load deep inside her.

After a minute or two of laying on top of her, he pulls out and stands up on the bed, his cock still half hard and covered in both their cum. He says “come here”, but when Julia starts to sit up, he says “not you.”
I am furiously horny at this point so I obey without thinking. He doesn’t have to tell me what to do - I immediately wrap my lips around his cock. He doesn’t guide me this time, lets me lick and suck every inch of him at my own pace. From time to time he’ll say “you missed a spot” where his cum is still glistening. Eventually, he’s fully hard again and pushes me away with a quick “Thanks, that’s enough.”

He lays down again and grabs Julia by the hips, hoisting her on top of him. She likes being on top so she can control the speed, but that’s not what he has in mind. He grabs her close to him and pushes his hips up and starts to fuck her mercilessly, and she is absolutely loving it. I’ve never heard her get that loud before. I look down to see her fat ass jiggling with every thrust, and every time she briefly pulls away her tits bouncing like wild in front of Mikes face. He never stops to squeeze or suck them like I would, to him this is just about fucking her as hard as he can, and he does. I listen to her cum over and over as he keeps fucking her until she’s basically collapsed in a heap on top of him and he rolls her off of him between us. On his knees he mounts her chest and shoves the tip of his cock in her mouth, both her hands struggling to stroke the shaft as her arms tremble from how exhausted she is. Watching her absolutely worn down with her makeup everywhere and this giant cock in her mouth is too much for me and I cum next to them, mostly all over myself. Just a moment later, Mike slips back and even though has already cum once, covers her tits and even part of her face in several more ropes of cum before collapsing on the bed beside her.

Just like with me, Mike falls asleep almost immediately after using her up. Julia grabs a shirt that we both share between us trying to wipe all the cum off but end up falling asleep before we can finish the job. When I woke up in the morning - Mike was already gone and my cum-crusted, runny makeup girlfriend was fast asleep beside me.