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It's been 25 years since Mac and Sugar Belle have been married, what happens when a romance from the past pops it's head up again?

It's been 25 years since Mac and Sugar Belle have been married. They have a kid, a succesful farm, and a wonderful relationship! When Applejack and Rainbow Dash go away on a mission it is just Mac, Sugar Belle, and their kid... until Feather Bangs shows up?

What happens when this romance from the past pops it's head up again?