How about we have a violation where the target is this uppity missionary bitch who travels to some far of island or jungle and tries to convert this tribe of savage lesbians to the ways of Christianity. As you can guess, it doesn't go too well, and the violation begins. The violation should probably include the use of dildo tipped spears.
Another idea is one so obvious I'm absolutely shocked it hasn't been used for the Violation of series. Cheerleaders, I mean it's almost an entire genre in itself. There are a few predictable premises we can easily pin on to a cheerleading scenario, so I'm not even going to bother with that. My personal suggestion is to have a team of bitchy cheerleaders recruit a nerdy yet potentially hot girl. However, this is only done as a cruel prank. The violation takes the form of an initiation ritual in which at some point it is revealed that the cheerleaders have no intention of letting her become a cheerleader. A cool idea might be to Pom-Poms with dildos for handels that they could stick up her ass and make her shake. In the end she is left humiliated and alone. Obviously this one lacks the series' trade mark sense of justice and irony, but how much of a drawing point is that any way.
Also, it would be cool if one of these movies ended with the girl being bukkaked by ejaculating strap-ons, now that would be something I'd see.