[All of this is going to be hard for him, Ai knows that because she's been in a similar situation. Neither one of her parents knew her when she first arrived and it hurt. Then they'd both forgotten her and that had hurt. Now her brother would experience that as well - not just from their parents but also from her because she doesn't know him. Doesn't even know his name.
So while Ai's words might be rough, her touch was meant to soothe. It might not be enough to stop the pain altogether but all she could do was try.]
I'm going to call you imouto-san anyway. [Huffily as if that's really going to change anything. Of course she'll call him by his name but she's also going to say he's her little sister.
When he steps closer, Ai lifts her other hand to his hair too, running her fingers through it. Right now it isn't about how she feels but how her brother feels. Things are going to get worse from here on out.]
How much longer are they going to make me wait for you?
[He's right in front of her now but there's something about seeing her sibling all grown up that makes her impatient.]