Sister-in-Law, Open Up! It's Me, My Brother.

"Inheritance from Older Brother to Younger Brother"

--But what if the older brother isn't dead?

Big Brother was dead, and the house was still cold, but Killua could feel the heavy shadow hanging over every member of the family.

At the funeral, looking at Chrollo's pale, expressionless face, Killua suddenly remembered a custom he'd heard about during a mission:

Among a remote tribe, when the eldest brother died, his surviving brothers could inherit his possessions after his death.

Including his wife.

Warnings before you read:

1. This story is completely unrestrained and unbelievably melodramatic! It includes branding and wall-sticking, among other things. Avoid it if these are triggers for you!

2. Zoldyck big and little cats x Chrollo (one-on-one romance)

3. Alternate-universe ABO setting; you can read it without knowing the original

4. Includes age-altering, and the little cat is an adult

5. Written for personal tastes, enjoy it within this corner of the fandom. There's plenty of bottom worship. If you don't like it, don't hurt anyone; please don't click!

Theme: Keep hope in your heart.