Write the dialogue based story about an average 7 years old boy and a 7 years old 3 feet 6 girl named NAME_1 who was born with two regular arms and two other additional arms that would end with mouths, complete with teeth and wide long tongues, and she lives in a family of humans. Even tough they don't serve much practical purposes, she'd play and use them as often as she can. The book will be slow paced and descriptive with as many details as possible. And there will be a lot of description around her movements, with a focus on her unique appendices. The unique appendices will be described often with great detail. The story will have no time skips. And the boy often asks about NAME_1's unique appendices