Under Gun and Key

You are a Detective that is on one of the hardest cases the office has seen. A young man seem to be committed horrible crimes. you were the only person to get close to catching him but you still failed. You finally chased him down the street into An old building. You got in an old room and saw nothing.
You got out your gun and searched the room. You heard a door lock and turned around quickly. It was him. The young man. what you didn't expect was your heart. It was pounding. Your mouth felt dry And for the first time....you lowered your gun. He came closer quickly. He pulled you by the waist and kisses you. To your own surprise.....you kisses back.
You knew you couldn't tell anyone what happened that night or all the other nights after that. What you two were doing was under lock and Key.......or may I say............Gun and key~