Rainbow Dash has a problem; she's about to turn 25, and decides she finally wants to settle down. But she's been off and on with, well, everypony. However, years after everything between them had broken down, she still felt something concrete in her heart for them. The only problem was, it was for all of them. Will any of them want to see her again?
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This seems like it's been done. Kinda 'Bachelor'-ish, but the other five don't know in this story.