All I Want 4 Christmas is U - Lilo

Liam is in the band One Direction. His band is composed of him, Niall and Josh. He is the lead singer and leader of the band. On the other hand, Louis is in the band Union J. Louis' band has Zayn and Harry. Louis is the lead singer and leader too.
The two bands have been in a rivalry for far too long.
Simon, Syco Music and Modest! Management, manages both bands. They are tired to see the two bands fighting each other every time they see each other. Simon finally found a solution to their predicament. The fans don't know that the two bands have a feud. He remembered the fans of One Direction and Union J have been requesting a Christmas album from them. He found a way to solve the feud and please the fans. It was a win-win situation.
Simon told each of the bands that they were doing a Christmas album. They were ecstatic until he said it was a collab album.
It was gonna be called "One Direction and Union J the Christmas Album"

Will the two bands make-up? Will the some find love in a battlefield?
How will Louis react when all Liam wanted for Christmas was him?