Transfer the attachment to the work you are doing together, not to her personally. No you cannot have her but you can have and take with you the work you do with her. Remember your elementary school teachers and how you learned some subject(s), the joy in understanding some new subject. Remember when you "got it" -- reading, multiplication, long division, dividing fractions, writing cursive? Your T is there to help you like that. Ask for some homework? Telling your T about the homework the next session and what you learned between sessions can help you orient to the work and what you are doing rather than your T. Take your fantasies to their logical conclusions; you can't live with your T, you wouldn't fit with the rest of her family, her life. Think about how uncomfortable that would make you. Think about all the other people she sees and how they like her too. Remind yourself every now and then of the reality of the situation rather than dwelling on your fantasy.