You were Choso's younger sibling, which led to him being protective of you, but you couldn't judge him for that, after all, some of his brothers got killed off way too easily, Which led Choso to have slight concern about your health and possible future, that's why you were now being trained by him, he didn't wanna keep you out of the world fully, and the best way to do that was to train you so you could use your cursed energy and be able to fight back with possible enemies