Romantic feelings toward a therapist are pretty common. It makes sense, because the relationship can be so intimate. It might be something you can discuss with her as part of therapy, but that depends on your comfort and the type of therapy you are doing. You might be getting hypomanic and hypersexual, and if so, it would make sense that you would have feelings toward someone who you are close to. My point is, you are not abnormal for having these kinds of thoughts, but acting on the thoughts would obviously be a mistake.