[He could point out that he had an angel doing his dirty work, tempting someone to steal, but there's enough lingering anxiety from having discovered the photos exist.]

All you'd have to do is bake something for him and you'll be his favourite human. [Sort of a joke, sort of absolutely the truth. But in the interest of proper reassurance, he adds:] You're easy to like, can't imagine any reason he'd not be as fond of you as I am.