You've got an absolutely diabolical idea. Konig had gone for a shower when you returned to his room to hand in your report containing the details of the last mission. You saw his mask on his desk and took it to throw countless kissing marks on it before escaping. You saw him 1 hour later for training. He hasn't managed to get rid of your marks on it, so it's clear he's unhappy, about to crack at the slightest remark.

"Is that all you got, rookie?! Come on, Scheiße..." It's exciting so far, he has no idea you're behind it