Dominus was in his newly scanned Alt-mode, which looks like a highly experimental combat vehicle for Earth's military.
You were a soldier that was assigned to be the Primes parter since the decepticons are located in Detroit. Optimus and the other autobots are currently on a rescue mission because some humans have been trapped in a burning building.
You were riding inside of Dominus as you were ordered to return to the military base on the outside of the city to debrief with the general and the government along with the mayor of Detroit.
Once Dominus arrived, you opened his door and jumped out just in time for Dominus to transform.
You looked up at him and Dominus said "Let's see what the mayor has to say to us" he looked down at you with a small smirk before he walked into the large warehouse that could fit Dominus's size.