Gym Girl Girlfriend Turned Into ... Slut By My Older Brother

I write fantasy stories on here about my jock douche bag older brother, who is bigger stronger, and more dominant and has a huge cock, and who charms up and sexes up the ladies I date in front of me, because he's a sadistic bully who turns them into sadistic bullies as well, and I get so turned on by it all. His name is JT. My name is Brody.

I'm a nervous, submissive pushover, who in intense bitterness resentment and jealousy, am always in fear of my womanizing dominant older brother stealing my girlfriends. I am often insecure and outspokenly jealous of my brother in front of the women I date which comes off very unattractive and works inadvertently towards his conspiratorial end goals against me. He bests me always and I hate him for it, left to watch him steal away my girlfriends like a villain in a weekly cartoon who always the main character win. I hate him, and he and my girlfriend both derive pleasure in how jealous, infuriated, and cuckolded he makes me.

Scenario 1: I start dating this unbelievably sexy gym girl for a few months and things are going well. She's got a massive pair of big all naturals, and bubble butt and so gorgeous. She is attracted to strength and extreme physical stamina and thus is constantly disappointed by how weak and out of shape I am in the gym. She drags me there all the time and instead of trying to improve myself, like some little beta male intellectual, I act snooty and try to philosophize about how gym rats and muscles are for idiots and suckers who waste their time. It's sort of a big disagreement, and really I'm just insecure and trying to rationalize my inadequacy but what's worse is now we're in a point in the relationship where I'm really horny and want to start having sex again after it's been a month. But I need an angle to make her physically attracted to me again. Then, to my great dread and anxiety, JT, my jock older brother, starts going to the same gym as us, and becomes a bit of a celebrity their. He's one of the most jacked bodybuilder-like physiques walking around and showing off constantly which causes women to oogle at him and cheer him on, the status of which makes my girlfriend attracted to him. Over a series of two weeks, he puts me to shame in a series of physical challenges in front of everyone including my girlfriend, makes jokes at my expense in front of everyone, all of which only makes him more popular and makes her very attracted to him. He approaches her for her number and recommends he become her personal trainer. She accepts with flustered excitement. Soon, they're going to the gym together every day and he always gives me these evil malicious looks like he knows exactly what he's doing, and he knows I know his plan as well. Soon, they start shooting videos in my living room where he demonstrates on my girlfriend how to stretch properly, especially the legs and pelvic area. People in the comments laugh as they see me sitting sulking in background of the video knowing full well I'm the boyfriend watching all of this happen. One week later after they've made the video, JT texts me a link to her .... I feel sick to my stomach because she never told me any of this and I'm surprised she would do something like this. She texts me minutes later saying she's breaking up with me. I'm in utter anxiety and dread as she follows up with the text, "And don't call me right now to talk about it, I'm having lunch with JT." Later that night, JT and her arrive at my apartment and waltz right in, a little tipsy and laughing. I'm a mixture of furious, hurt, humiliated, and confused. I ask them what they think they're doing here in righteous indignation as she told me she was going to leave me so why is she still here. JT cuts me off, shuts me up, and proceeds to tower over me as he authoritatively tells me they're both going to get to work tonight and "you're going to allow it! I'm in charge here, I call the shots and you do what I say, little boy." Then, I realized, my cunning, evil older brother was the one who convinced her to create an ..., solely for the purpose of powerfully humiliating me by cuckolding me on camera and posting it for all of her followers to see. They explained to me this was the case and she seemed like she didn't care at all about how it would make me feel, which turned me on to see her so sadistic and in the arms of the cruel alpha male like this. JT went into the other room and grabbed the camera. He started filming it like a porno where they interview the cast members first. He looked at me harshly past the camera and said I better fall into position (character / mindset that is) or else. He starts filming my girlfriend and I as we sit on the couch next to each other. I'm still dumbfounded it has all gone to shit so fast and that this is actually happening, so I don't say much but gulp in nervousness. My girlfriend smiles seductively like a naughty woman as she answers juicy questions about how she, JT, and I arrived at this situation with pleasure. He asks her measurements of her body, her favorite qualities on a man (physical and personal), her type (the mean alpha types of course), her favorite sex positions, etc. He's relishing all of this so much because of how much it bothers me. He then sets the camera on a tripod and commands me to get up out of his spot so that he can sit next to her. As he sits down, he commands me to get down on all fours in front of the couch where they're sitting. He talks to the audience saying, "ladies, sometimes you need a real man to come in and show your little beta male boyfriend how it's done, how to really please a woman." Still on my knees, my now ex girlfriend is stripping me of clothing slowly before she finally pushes my head back down to the floor gently. My ass is up and my balls swing in the crisp air between my split legs. "But first," he continues, "for all the men watching, all you gotta do is ask yourself one question: do you want to the beta.... or the Alpha?" JT then swings his leather belt good and hard through my ballsack as I take it in submission and yelp loudly. Being tipsy and sadistic at this point, my gf laughs hard and loud. JT whoops them again while staring down at me like a hunter who has conquered a great beast, and winds up his arm again slowly before swinging his belt into my cuckolded balls. He continues as the camera rolls and my gf laughs so hard at my pain which turns me on more than I could ever imagine. He declares dominance over me by rhetorically asking, "Who's the alpha dog!?" SMACK!!!
I reply, "You are SIR!!!" SMACK!!!
"I said, Who's the Alpha Dog, bitch!" SMACK!!!
"You're the alpha!! I'm the beta male, sir!!!" SMACK!!!
"I'mma give ya this belt right here!! SMACK!!! and you go'n take it like a bitch!!!" SMACK!!!"
"YEs Sir!!!! SMACK!!!
My girlfriend chimes in as she rubs her hands all over my brother's shirtless torso mocking me and telling me how hot he is for dominating me this way.
He continues for a while as I whimper and squeal but taking it with full pleasure in my own humiliation.
After a while, she can't wait anymore and is so horny so tackles him on the couch, they both unclothe entirely. She gets to see his huge cock for the first time, gasps and uuugghhhss!!! with pleasure and arousal as she gapes her mouth open and swings it in her hands to the camera to show it off. She mounts his cock and finally takes off her bra so her huge natural boobies drop and jiggle like the most soft bulbous perfect boobs you've ever seen as JT moans in arousal and pleasure as he begins to oil them up and squeeze on them. I scream in anger and frustration and jealousy as she quickly yells at me to "shut the fuck up and watch!" I cower back down on all fours and continue to softly whimper as JT makes mocking faces as me while he massages her boobs, his huge cock cocooned in her warm tight pussy. after a minute or two, he asks me how my nuts are feeling in an obviously hostile sarcastic way. Not really knowing how to respond so as to please his cruel mind, I just say, "They feel good, Sir!!!"

He looks at me with intense violent intent and says, "we go'n have to fix that!!" Knowing the drill, I rear up to the side of them backwards on all fours and raise my ass up so that he can whoop my balls hard as they cum. She begins to scream loudly in pleasure at he makes her cum and he begins to cum too. He smacks my balls rapid fire with the belt as I scream before dropping so that his hands are enjoying those big soft breasts as he erupts like a volcano in her pussy. They end the video after a while.