The point of the matter is the only person we're making reasonable progress with is our squire - everyone else we seem to be slowly offending or potentially stringing along because when it comes down to it the culture clash is bad enough to seem irreconcilable.
We've tried telling the girls to change and it's gotten us nowhere and Baeran seems decently set in his ways. How are we to seduce anyone if our hero has fundamental issues with core aspects of the girls? ARE we supposed to be seducing them? If so... how?
The biggest overall issue has been a few ethical issues and their rather strong disinterest in consent. And in that regard, they probably shouldn't be hanging out with a paladin. Though that's not all of it.
The big issue with Ignis is that, like most barbarians, she's a meathead and an asshole. That's not something necessarily baked into her as a Salamander. If she can be convinced to be less of an asshole, being a meathead isn't a big deal. Nor is the sex requirement. The problem there is that's its very hard to convince meatheads to change.
Brynhild is... probably a mess of issues that only start at what her instincts push her towards, and is in need of a lot of help in general.
Miki and Ilias are kinda unknowns, though by reputation Ilias is more of a problem then the entire party put together and there's every chance we will end up putting her to the sword.
As to whether Bearen is supposed to be seducing them, given Brynhild and Ilias were actually dropped on his head by spells related to his goddess, I'd say yes. If Bearen wants to do that is another question. What things is he willing to bend on, and what boundaries should the monster girls not push? This shouldn't be all or nothing on either side.
Or to put it in story terms, everyone needs some character development.
Baerun is going to be pissed when he finds out what MGE's gods have gotten up to.
He's going to be pissed at everyone, that place is just pretty damn shit
I see this story isn't going to gloss over the inevitable body dysmorphia that is the mamono conversion process.
Yeah, I was getting those vibes. That and the almost certain rape are issues I feel comfortable calling right now.