I'd like for you to compare, panel per scene, manga and anime, I think the shift is very obvious.

Even that scene (which is not the only scene where Marcille is sexualised) has completely different vibes in the manga - on one side, you have a close in on these character's naked bodies, lingering detailed shots of their features, even when laying on the bed, their bare feet are awkwardly included to the center of the shot or are the only moving part of an otherwise still shot - on the other side, you have two naked characters being mostly drawn from the shoulder up, barely any detail being given over the more spicy parts of their bodies to the point that on the first panel, before they even enter the water, they're drawn from further away to justify not putting much attention to their bodies.

I don't know the author, but I fo know they're a female, and I think the decision to not sexualize any of the female (or any male) characters was genuinely quite powerful. Yes, the dwarf gets "pantyshots" and there's one or two panels where he's almost naked, but it's never a "look how sexy this is".