/lit/ - Literature

Guys I need help please tell me if my premise sucks or not.

I want to write a story exploring parasocial relationships by kind of inverting the traditional fantasy hero's journey. The setting is a vague historical fantasy world (not entirely sure which time period I want even, I fucking hate world-building). The MC is an Underground Man bitter autist shut-in type character who becomes obsessed with another character, a military commander who vaguely fits the mold of a traditional Arthurian hero. He dedicates his life to living vicariously through the "hero", alternating between obsessive love and jealous seething, while vastly overexaggerating the "hero's" actual heroic traits. The plot mostly consists of him going to extreme measures to influence the "hero's" life in ways that he thinks would make for a good story, to the point of deliberately turning himself into the "hero's" antagonist and otherwise forcing obstacles into his life.
Does this sound gay and cringe or like it could work? My biggest fear is that it'll be boring and the "hero" character will come across as an annoying Gary Stu from how much the MC waxes lyrical about him, but I want it to be kind of clear that the MC is an unreliable narrator who is progressively losing his shit.