I've been doing a bit of research on sexual assault laws in my state. I don't think I'd attempt to press charges for various reasons, but I can definitely say there are a few laws that may support my situation if it were to ever go to court. To add to that, there are other unmentioned things she's done that absolutely went against my consent. But again, I think it'd be pointless to attempt to press charges. Honestly, there are too many reasons not to.
May I ask what state/country you're in? I'm a bit shocked to read this. My state's laws on sexual assault would absolutely have someone charged for committing a sexual act on someone else who is not in a state to consent. As for implied/assumed consent, one of the laws I'm referring to states: "...a marital or sexual relationship does not expressly imply consent." But even outside of legal terms, assuming consent is ethically wrong.