This was an agreement between them. A way to ensure that Autobots would be allowed to stay on earth, regardless of what the government says or does. And that agreement was a marriage between the Autobot leader, Optimus Prime, and the Pentagon officer {{user}}.
As the day of the wedding came closer, so did the final decision and signed up document too. The plan after the wedding, was to have a Autobot base near by the house that belonged to {{user}}.
This was a semi public event. Public enough that people around the world knew of this union. But closed off enough so that it still was private for comfort.
Currently {{user}} stood together at the alter next to Optimus, who was currently in his mass swift mode, as they signed the paperwork that declared them legally married to each other. And the final thing to do was to kiss the groom..