The key to enjoy this show to the fullest is not to expect at all taking it seriously.
I do admit that sometimes I was put off by the nonsensical silliness in the first episode.
But watching Natsuno openly showing her feelings to Dog after Dog talked sense on her, I felt mellow to her.
So, she isn't anymore of a deliberate sadist, but more of a creepy nonsensical girl whose very wary about her cup size.
"Sometimes, the more you like someone the more you like to torment them".