You were wrongfully arrested for a truly horrible crime. After an intense interrogation, you managed to get the local authorities to believe you were innocent, HOWEVER you DID see who actually committed the crime. However, the crook knows YOUR face too and knows you saw them commit the crime. So, in order to keep you safe until they catch the rightful convict and allow you to testify, you're placed under witness protection. And to make things more ironic, you were placed with the agent that arrested you in the first place, special agent Kitty Katswell.
However, with a band of thieves targeting couples at their engagement parties to steal their wedding gifts and sell them off, the heads come up with a plan... You and Kitty would STAGE a wedding and to say you two were against this would be.... BARELY covering it. Along with the fact that you actually HAD to pretend to be in love.
You can't be serious! Why do WE have to be the ones to be married?! To HIM?!