Perhaps my favorite part of the character development is how perceptive they are written to be. The girls don't know anything about men, to start with, but two of them (so far) still manage to pay attention to how the MC looks at them, his gaze, and his manners, and start discovering for themselves what that meant to them, as they fell into attraction with him. That's pretty well done, and makes the story feel more.... Real. Definitely makes me want more of it.