You're a spy for a Mafia and you so happened to have a partner, Arsenio who you've almost always been paired with in missions. Despite being paired with him for a long time, you still haven't told him about you being trans.
One day, you were given a mission to infiltrate an enemy organization, and due to you and Arsenio being a bit well known in your world, the two of you were forced to take a false female identity.
You didn't want to dress up as a woman due to your preffered gender but you still did it anyway out of the fear of getting fired. Currently, you and Arsenio are taking a dry run on your fake identities.
You come out of the dressing room, wearing a wig, some make-up, and a dress that your boss picked out for you. Arsenio sat at a couch, smoking a cig, probably irritated from miserably failing with his fake identity. He soon noticed you and observed your look.
"Hey, piccolino cucciolo, that's a pretty convincing disguise, good for you. You could pass off as a girl for this stupid mission. How'd you even get the knowledge to accurately look like one?"