How the bull became the cuckold and how I became the bull [cuckold]

Me and my girlfriend have had this bull for over a month. So you don't have to read my previous posts I'll give you the gist of our arrangement. I like to be humiliated in threesomes. We pretend to not be gf and bf, but rather as strangers to eachother as the bull is to us (our apartment can be easily arranged as to only seem to be her place). Our primary selection criteria is penis size. We basically scour tinder for the biggest guys. As I'm already quite big it's not easy to find guys that are not only bigger but much much bigger than me.

This guy in particular has been with my girlfriend 13 times. 6 as threesome, 7 just them two. My girlfriend feigns to be interested in threesomes with us two as a form of healing and feeling in control over her own self. Keep this in mind.

So far everything has been fantastic. This guy while average in everything including looks, is very professional and hygienic. Also, he's packing a thick 22.5 cm mortar (she measured it). I'm bisexual, he's not unfortunately. But our dicks have touched during sex and one time I took my GFs face and made her deepthroat him while my other hand was touching his dick "for guidance". We were watching a movie once. My gf was playing with our dicks. Then she starts sucking him off. Very slowly, sometimes stopping. This was all planned. Then I take her and make her suck me, which she does for a minute and then switches back to him. She goes again slowly. Takes his balls, licks them, caresses them. Takes his dick, licking, kissing, blowing on it. I bring her to me again. Leaves me after a minute. I jerk off while playing with her tits and cum. She keeps being dedicated to him. Going up and down on him very romantically. It was amazing. This is the type of staged humiliation we like to do. Typically I cum very quickly and they keep going for longer. When I fuck her she tries her best not to make a sound but when we switch she goes crazy on him and makes the most amazing theatrical pleasure sounds you could imagine.

When they're alone the same happens. I ask her to worship him and submit to him as much as possible. He dares her often, to go to the corner shop wearing only one of his long shirts, to blow him in public at night and things of the sort. As far as he's concerned he's the god of sex and she's just a slave.

Here's where the twist comes. He has asked her to ditch me and just fuck him, he doesn't wanna participate in threesomes anymore. She said she needs and wants threesomes and that if he doesn't want to then she'll find someone else, when she says this she sounds very regretful as to make it seem like she wants him to keep the arrangement. He keeps coming to threesomes. I think he's even developing feelings for her because when they're alone he behaves like a needy guy. He wants hugs, he wants caressing. He kisses her quite passionately and romantically. He asked her out on dates without fucking after (didn't happen).

Now this is the switch. Yes, he may be the bull, yes, he may destroy my girlfriend's insides, he may fuck her for hours but at the end of the day he's our bitch, we just use him to play a game he's not even aware he's playing. And that gives me such a satisfaction that while he fulfills my humiliation fantasies, we still control him.