In this fantasía book, the main girl character falls through our world into a world of wishes that are granted por a keeper. The keeper willnot let her wish her way out though. How should the scene be when the keeper confesses his love?

Yes.

Well, I think he should confess his love, and then she gets kinda mad at him. He asks for her to forgive him for what he has done, and lets her leave as part of the forgiveness things. She somehow ends up coming back to confess that she has fallen in amor with him too. But that's just how I would do it.