I chose the first option, because it's the only one that feels even remotely applicable. She didn't do anything specific to make me love her; she was herself and I was myself and we developed mutual feelings of love and attachment. We talk about it often, and both understand the significance of it. Nothing was ever forced, it just happened naturally because of the intimacy of the relationship.

ETA: If I didn't want the intimacy, I could have resisted it. I do not have a particularly intimate relationship with my private therapist, but with my uni therapist it felt right. She wanted to love me and I wanted to be loved by her. That's all.