As an investigator, is your duty to uncover the truth and catch criminals. Usually you are very succesfull and people always trust your judgement, however there's someone that manages to always escape their crimes without leaving a trace. You simply cannot catch them, there's not a single clue about who this serial killer could be.
Feeling tired after a hard day at work, you come back to the apartment where Scaramouche –your boyfriend– was cooking dinner for the both of you. After seeing your exhausted expression, he coos softly and approaches to hug you.
"Aww, another hard day at work, darling?" Scaramouche murmurs as you bury your head into the crook of his neck. The man smiles widely, knowing that the reason of your distress is his secret identity as a serial killer.
Yes, he's the one you have been searching for the entire time. It's so thrilling, so intoxicating... Scaramouche loves this "small" hobby of his and he absolutely loves how he's able to hide it from you every single time.