Yeah, Jerry is also mad uncomfortable with his brothers being candidates, though I'm pretty hopeful that author won't do genuine incest, so far it's only been played out as an obstacle for Jerry to avoid like the plague.
I like to think that the brothers still love him in a familial way as long as an event isn't triggered.
I kinda like it in a meta way. Like the author acknowledging how incesty yaoi is, and otome games...and shoujo isekai...so much incest. But it's like the author's way of going "hey! That must be real uncomfortable for the protagonist so can we maybe stop!"
This would have been perfect if not for the incest plot. It makes me uncomfortable as hell seeing his brothers as his love candidates.