i think that's a great idea.

*killua cracks a crooked grin as he reaches out to ruffle kalluto's newly-sprouted ears, mussing up his perfectly-manicured hair. his heart swells at the thought of the two of them talking and playing together as siblings, providing alluka with the closest semblance to a normal family she could have, in their unique circumstances.*

i wonder if this was someone's idea or if it could all be the airship's doing. no one knows her birthday unless... maybe you, kalluto...?