My female cat does this with me, and I don’t know if the “taken from their mother too early” thing has any bearing on it, but it would certainly fit my cat. When she was born, her original human couldn’t handle having 9 cats in the house, so she begged me to take this kitten when she was only 3 or 4 weeks old. I had to bottle feed her replacement cat milk, and she tried to nurse on me for several weeks. She has aggressively groomed me ever since.