[COI V8] Lumian isn’t gay

I've read both in comments of the novel and in this subreddit that some people think Lumian is gay and I greatly disagree.

That isn’t to say I'd dislike him being gay, I'd actually very much appreciate a queer MC, but he just isn’t.

He has been in a relationship (sorta) with Franca who was once a male but is now both biologically and mentally a woman (she sees herself as a woman as seen in the dream arc). While he himself is male for pretty much the entirety of the story and also sees himself as male. He also only did romantic/sexual stuff with Franca/Jenna while in his male form.

So yeah. It was only ever male x female for Lumian and he also only ever had according thoughts so I just don’t see how he could be labeled gay.

That being said I‘m pretty sure Franca is bi or something like that.

I'd like to hear your thoughts, do you think Lumian is gay? And if so why?