Private to Oliver - 9:31am Are you kidding me right now
A real marriage? No. An annulment requires a canon law tribunal, extensive documentation, and can easily take months or even years. I'm not a canon lawyer and don't have the training or authority to declare a marriage invalid.
A fake marriage, maybe. It's possible to come up with in-character reasons that would be so egregious as to render the marriage invalid even to the judgement of a non-expert. What's the context here?