BTS Has A New Member {Jungkook X BTS}

BTS gain a new member, Jeon Jungkook. Jungkook has been going through rough times until that point but the members don't know and treat him badly because they've already debuted 1 year ago. BTS don't need a new member, they've been doing fine. Jungkook now needs to try and fit in as well as cope with his own problems that have stained him since childhood.
Even worse, Jungkook ends up getting a weird power.... He gets the ability to play around with time! (But since it's a fanfiction and a fanmade book, I'm constricting it so that if I don't want Jungkook to time travel, then I won't let him and he can't.)

Smut level: Hardcore!!!!!!!!!!!!!

BRUH! SMUT LEVEL IS TOO HARDCORE!! ITS GRAPHICAL!!!!!!! IF U ARE TOO INNOCENT THEN I SUGGEST YOU FIND ANOTHER BOOK!!

But there isn't a lot of Smut.