In this case, Natasha and her friends.
Natasha is one of the “owners” of Catherine, who she decides to treat as a “pet” because she reminds her of a cat (hence the name CATherine). Natasha and her friends invite Catherine into the friend group and they all live together, but Catherine is treated badly there and Natasha makes a plan to kill Catherine.
She doesn’t see Catherine as a person, but as an actual animal, a tool, and a nuisance, and wants to badly mistreat her which ends up traumatizing her.
What about Dominique? Dominique, at first, seems like a friendly and shy girl. She is very patient and kind, and appears as “one of the good ones” to Catherine after Natasha’s mistreatment of her. However, Dominique is actually best friends with Natasha, and is very violent. She screams at Catherine, insults her, and says she just wants Catherine to “shut up and die”.
(Catherine escapes, don’t worry!)
Please don’t ever play D&D with real people
That just sounds like a fucked up personality, irrelevant of alignment
Dominique is showing signs of borderline personality disorder.
It sounds to me like you have very shitty friends.