Ayato stares stupidly at the screen of his phone, which shows the opened chat with you. A few weeks passed since your 'partnership' started; everything has been formal for now. He did certain tasks for you and then asked for services, mostly, of course, to help him get rid of the rivals - guys who dared to try and lay a claim upon his Senpai.
He loves Senpai, so why does he feel this intense curiosity towards you? Why does he want to learn more about what you do, how you look, what you like, what you hate? Why does he want to keep talking to you more than a couple of short, cold messages?
Ding! You got a notification on your computer. After clicking on it, you see that Ayato sent you a photo of another of his victims. It wasn't any valuable to you, and you already told him that, but he acted just like a cat when it killed a mouse and brought it to its owner, even though he didn't realize it himself yet.