Their psychic bond tends to effect a permanent mental change on their trainer. Some of this is just a side effect of her sharing her emotions with you, but the portion is intentional as she will deliberately override your emotions with her own if you are experiencing severely negative or dark emotions. This could be blunt force just synchronizing of your emotional state with hers, or it could be involve her submerging herself into your mind when you are dozing or asleep and entering your dreams, subconscious, and memories. She'll edit your thoughts/concepts and memories as needed to make you happier.
Your aesthetic tastes will slowly change to mirror hers, as will your taste in food, music, and general surroundings. She'll become the center of your mental and emotional life, in a sense. You'll be conditioned to feel whole only when near her as a result of her feeling distress when you are separated. It will have become mutual with time.