The conflict of this narrative was drawn by the core issue of many a real life conflict-- people not talking. That's not inherently a bad thing. Not everyone is emotionally healthy enough to talk out their issues, or has a partner they're able to talk to.
The problem is where this narrative's conflict meets essentially the core of the work: it's focus on BDSM. BDSM, when done healthily, is all about communication. What are the limits, what is liked and not liked, when to stop. This is hinted at with the safe word and the alleged aftercare, but we don't really see the aftercare on the screen. We see get hints of poor aftercare, which makes me wonder why they didn't break up earlier.
Why does it take getting to the sex club to get there? What is the thread that keeps them together when Hadrian is so not enjoying it-- is he so demure that he can't express his dislikes at all, even when theoretically empowered by being a Dom per the outcome when he's chosen? Sebastian and Dom are friends of the nameless protagonist and Hadrian respectively-- they don't get into proper aftercare and discussion matters with their friends either?
It feels like the characters are islands, of sorts. They're isolated. They don't properly connect barring when we're told they connect, but we don't see hints of them connecting in the undisclosed downtime. They are rocks. The aphorism is "no man is an island", but that's true, they're barren rocks, vestiges of concepts of sexuality but with little underneath. They are just coming off as libido, with the most hints being the protagonist concerned that Hadrian isn't into being a dom but when he knows he wants to discuss it, he jumps at the opportunity to go to the sex club and fool around (perhaps with others that aren't his not-quite boyfriend, of which the two choices leads to a breakup).
The breakup scenarios feels more honest. The instance with Hadrian feels like a halmark movie ending, of sorts. Where he comes to Jesus and lets his not-quite boyfriend take the true lead as a Dom ("true lead" as though he doesn't come off as the actual dom given his prior commands for Hadrian to take control in the manner he sees fit, as opposed to the Hadrian choice where Hadrian takes control in the manner he chooses).
When he sleeps with the friends, that feels true to the narrative that was expressed before the choice. An inability to communicate, to choose his own needs above his "bfs". A lack of the ability to empathize with what others are thinking, like an underdeveloped theory of mind. Cathexis is apt, as it does feel like an obsession that pushes other elements aside in this narrative.
The presentation of this story was well done, and I quite liked whatever music you found that represented the horny times-- if that was free music it was relatively slapping, but it felt like the desire to portray the BDSM sex and scene overrode the character's abilities to act and react in a more "human" way unless approved by the narrative's choice. At least, if one considers a "happy ending" to be what needs to be earned.