He [D'Artangnan] succumbs to her [Miledy Winter] level of...

He [D'Artangnan] succumbs to her [Miledy Winter] level of seduction and gives into it. It's only when the series starts to progress that he realizes what she's doing, and the tables turn slightly. But that relationship really pays homage to how D'Artagnan can be easily swayed. You see him grow into somebody who can actually make a decision where he's not being used and forced into doing something that he doesn't want to do.