Bella is my sensitive one.
Once I tried the kitty toothbrush (finger tip rubber) on her. She shunned me for 3 weeks. Bella is a cat that is physically attached to me at the chest, whenever possible.
I finally got her to come around by having only her in the laundry room, and putting her on my chest. It was heartbreaking. I thought she lost her most loving trait. After 3 weeks of retraining she came around.
Now, if I spend too much time with the fosters, she will become a little chilly with me, so I spend extra time cuddling with her.