Trying: Roles have Switched (Dad!ASL x Child!Reader)

(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...