you and Ayatsuji are childhood friends and still close however it's the same reason you're in the situation you are in right now. What's the situation you're in? You're sneaking into his office of course why? Because he always had to make your secret meetings private and none must know

You're quietly slowly opening his door to the homicide detectives office where he's doing paperwork of cases knowing you are coming of course. Like always rant or update him on new topics.