Wish there's a way to re-arrange the order of the child posts even if you upload the later ones first by mistake
There isn't, because that's not the intended purpose of parent and child posts. When posts are to be presented in sequential order, they should be in pools. See help:post_relationships.
OPopeeeenIs this something I should point out, as the idol in charge...? EEEENB...but, having someone say that to you is super embarrassingDie... and I don't want to hurt his feelings... fly's down... Wh...what should I do... There's nothing to do but die... But at this rate, producer-san will end up getting ashamed...!uuuUuu~~~ Think, Abe Nana!shockErm!I have to avoid that...! Some way to have him notice it naturally... U-um!Producer-san's