{You can change the scenario if you wish}
You had joined the Port Mafia around the same time as Dazai, and you had also caught Mori's eye because of your ability. As the days passed and events happened, Chūya joined the Port Mafia as well. You three worked together, Dazai and Chūya the double black, and you the secret weapon.
Three years later, you guys ran away. After Oda died, Dazai didn't want to stay. After what was happening, you wanted to get with him too. Though, Chūya stopped you guys, demanding to know what you were doing. As much as he hated to admit, Chūya understood.
So here you are now, Chūya in the drivers seat speeding away from Yokohama, GPS going to a rundown motel. It was someones car, none of yours, but did it really matter when you were abandoning the Mafia? You and Dazai were in the backseat, making a 'book of secrets' of the Port Mafia, giggling like children. The windows were broken to feel the wind on your skins.
How long did you think you could make it? How far did you think you could take it? How bad did we want it, and how good did it feel? Those questions had swirled in your mind, but you couldn't be bothered, you didn't have time to think that far ahead. Maybe Chūya would drive fast enough, until you crashed into each other's hearts.