Two people use this account:
°Shiro°
and 
•Kuro•
So, our books are published by either one of us. To find out who there are different marking on each book to indicated who's it is. 
Shiro: °(book title)°
Kuro: •(book title)•
We will also collab in other books  (or chapters), and the symbol for that is °•(book title or chapter)•°
~now a poem~

Roses are red,

Chivalry is dead,

Along with I, 

Your presence rises me up like the crust of a pie