[Alluka's own heart bursts forth, beating steadily against her brother's sturdy chest. Alluka doesn't want any of this to end, very much dreading when they inevitably end up having to pull themselves apart like a grilled cheese sandwich. For now, she's focused on kissing. On deepening what they have as much as she can. She gently nibbles his bottom lip, sucking it between her own lips before sliding her tongue past it. Her other arm wraps around the other side of his neck, holding him in a side hug like the precious treasure that he is.

Killua was hers and nobody could take him away from her anymore, leaving the possessive girl confident and happy.