It’s been five years since Rainbow Dash and Big Macintosh became a couple. It’s been five years since Applejack put their relationship in danger. It’s been the best five years of Rainbow Dash’s life. She and her boyfriend had spent so much time together over the past five years, and now that she is fresh out of college, she decides that they are ready to move in together!

It’s a big step, but the two both believe that the time is right. However, Sugar Belle, a young, beautiful, and sweet woman introduces herself and Rainbow’s neighbor and later discovers that Big Macintosh moved in as well. It turns out that both Big Mac and Sugar Belle have dated, and have a very special bond.

What does this mean for Rainbow?