Just a replacement (one direction)

Jake is a regular boy with regular problems, his life isn't really exciting but there's nothing wrong with it.
One day, this all changes, in the morning he takes his sister to a meet and greet with One Direction, that same night he has a different life. From that day the only people who really know who he is will be his bandmates and sister. Jake is replacing Niall Horan, because Niall couldn't handle all the fame anymore.
Jake learns more about his bandmates, they become his friends. His sister falls in love with Liam and they all seem even more happy when NIall comes back.

Did Jake over his own happiness for every one else? What will stay the same when everything changes back to how it was before?