How much of a 'triangle' is this? I need to know before diving in

Not really a love triangle since MC isn’t remotely (romantically) interested in the third wheel. And the third wheel is more like an antagonist than a second male character…idk how else to explain this

The blondie mf only wants to see the seme (also a mf but better) suffer and he thinks of the MC (the cutie uke) as a sex toy I would say? Because that mf dentist is all about abusing and ducking