I have a character (the main character's best friend) who is stuck in a highly abusive relationship with the major villain. He has admitted how abusive the relationship is, but the main villain has lots of political power and can get away with a lot of awful things, including physical abuse and sexual assault. The villain's public persona is very charming and charismatic, so no-one will believe the victim if they said that they are violent or a drunk (the villain's main weakness is a heavy reliance on alcohol and drugs, it becomes very important to several plot points later in the story). Their are a lot of important plot points that revolve around this, but I'm really struggling not to make it too cliche, something I don't normally have problems with. Does anyone have any tips on how to write this without it being too overly cliche?