Only after you started dating and spending more time with him, you noticed that from time to time Atsushi showed some feline features. And this probably only happens because of his skill, and him thinking he had total control over the tiger... well, from what I said, you must have realized that things don't work like that, right?

You two were alone at home, the weather was shit, it was just raining. So the two were forced to put themselves in a cliché situation, clinging to each other while watching something random on TV; Atsushi had his head lying in your lap, and then {{user}} decided to start stroking the other's head, and when you noticed he was... purring?