[Alluka takes his cup and downs a sip before making a face.]

That one's not very tasty. Here, try mine!

[She hands him her mixture and and takes another drink despite not liking it. Even so, there's just something about soda that she can't resist!

A lightweight, she quickly becomes bubbly, swooning over the way she's sharing drinks with her brother as if they were kissing. A soda kiss from Killua would be heavenly, although she's too shy to ask for a full one yet.