Straight: Draco is dating Violet, but is cold, controlling, and sexually abusive even though he really loves her; she loves him back but is conflicted about his behavior. His dominance and her distress are presented as titillating.
Exaggerated: Draco is an obsessed, possessive, and sexually and psychologically abuses Violet, doing everything within his power to convince her that she should submit utterly to his control because of his love, but it's still intended to be sexy and romantic.
Downplayed: Draco is quite jealous and clingy, and sometimes accuses Violet of flirting with other men even when he knows she wasn't. This is presented as romantic and a symptom of his love for her. He also often teases her, which is supposed to be cute and oddly alluring even though it sometimes crosses the line into hurting her feelings. Nonetheless, he's not abusive, just a jerk.
Draco is Troubled, but Cute, and his abusive behavior is fueled by his crippling insecurities
Violet grew up watching the men in her life treat their significant others badly, so she doesn't know anything else.
Violet, despite looking all innocent, is plain masochistic and groveling at heart and will always bow down to the ones who abuse her because she believes Might Makes Right.
Zig Zagged: Draco sometimes abuses Violet on certain days, but treats her like a princess on others. It's not specified rather this is a way Draco keeps Violet thinking she can "change him" and stay in a relationship with him, like abusers in Real Life sometimes do.
Violet refuses Draco's advances because her gut tells her that he'd treat her badly.
Draco is in no way abusive and Violet is never hurt by him.
Enforced: The audience likes rape fantasy, but they want it in a nice safe romantic concept, so the writers use this trope.
"He may molest me and order me around me all the time, but that's just how he shows his love!"
Draco actually wanted Violet to resist to his abuse as he gets off on conflict rather tha dominance. As his abusive tendencies escalate to outright violence, Violet still lets him beat her black and blue. He eventually kills Violet in cold blood, but not before telling her that she's nothing but a formless blob of cowardice that shouldn't be allowed to live or reproduce.
Violet dates Draco, because she's afraid not to, but ends up understanding that abuse is love and they live happily ever after.
Violet comes to realize that she's masochistic and gets off on his behavior. They enter a consensual BDSM relationship with clearly specified limits.