Trying: Roles have Switched (Dad!ASL x Child...
(A One Piece story, the parallel version of Kirakux's story: Trying. Go check it out if you want to, it's a great story.)
Luffy, Sabo, and Ace were all adopted from the same orphanage by the same person. As years passed by, the youngest of them thought it would be a great idea to adopt a kid of his own, so he adopted you from the very same orphanage he grew up in. However, as sweet and adjustable you are to your new dads, your friend was the very opposite.