I looked at the raws, and MC is not a gay nor straight, he's just passionate about being priest and basically, he's off limits to any form of relationship, obviously he may sound homophobic but that's how he was taught in that religion especially in historical settings which is stricter than now so his moral views about gay relationship is like that.
While looking through the raws, he was repeatedly graped, you read it right gRAPED, of course the guy was still unknown but judging from the skin color and when it started, I am pinning my bet on the promiscuous scandal maniac prince.
I felt endless pity for MC like I wanna hug him so bad because imagine that a Nun and Priest tried any possible way to not be sexualized and they were dressed so properly from top to bottom but then we have Mc getting gRAPED, everytime I skipped, I always end up in a chapter where he was graped.
He was crying and needed helped so bad