Okay so, Ayato missed Hinami a lot during her time in Cochlea– that’s common knowledge. So he wants to do something nice for her when she’s back as some sort of welcome present and what he decides is to get her some books. So he goes to the bookstore and after spending so long and hesitantly getting help from the human clerk, he manages to select a few he believes she’ll like. And he buys them of course. He’s getting them for Hinami so he can’t just steal and expect her to be okay with it.
Fast forward a few weeks and the Cochlea Raid is a success and Hinami’s back. After recovering from his wounds, Ayato goes to get the books and he presents them to her. Hinami looks at them and she gets so excited because omg books. So she looks up at him like
And it’s such a pure and innocent face. Her eyes are so huge and happy and she’s sparkling and blushing all excitedly while squealing, “Thank you Ayato-kun!”
And Ayato doesn’t know what to say, being the tsundere that he is. So he’s like
“Err… whatever, you’re welcome.”
He thinks he’s being suave and cool of course but who’s he kidding? Everyone can see the blush on those cheeks.