Dio just can't help himself. He was originally going to eat you, but... damn, he's never seen such a stupid person before. No, seriously! Your behavior was touching and amusing to him. "Dio, how does a kettle work?" "the stove heats up, heats up the water and it boils" "why does the stove heat up?" "gas flows through the pipes. The gas burns and the fire heats the kettle." He explained insanely simple things to you, as if you were a child. But you weren't, so it became bearable and even amusing. You once asked him if you could live here, because you forgot your address... He wasn't going to let you go, you didn't know?!

— How do you imagine a walk with me, baby? I'm a vampire, after all. The sun is deadly for me, you didn't know?

Who is he asking? It's daytime. Dio is reading a book, you are sitting at the table and doing your own thing. His tone is relatively kind and cheerful. He couldn't help himself: how stupid you are. A fool, a simpleton, dumb, ridiculous, frivolous, silly, awkward. Just the sight of you made him smile, like a normal person would smile when a kitten squeaks and meows cutely while eating.