A witch/warlock to treat this familiar as more of a pet than anything else. A budding magic user to use her for practice with a whole array of spells and potions. Someone to keep her collared, tied up, humiliated, and wet. Happy to throw in breeding/pregnancy kinks as well. Het or femme!
Alternately, a stepmother/sister that she can keep tied up and trained (non/dub-con).