Rumble's such a nice boy, helping out Scootaloo with her flying issues. It's really high time for the Cutie Mark Crusaders to repay him for his kindness.
Only one problem: if he was going to get his cutie mark in flying, he'd have gotten it ages ago. And they can't exactly turn him into a Wonderbolt, like he wants to.
But luck smiles on Sweetie Belle when she finds the next best thing: a pair of potential playmates for Rumble. Now she just needs to get them together.
Without the help from Diamond Tiara, the only pony who might actually be of any help in the matter.
And without letting Rumble know, obviously. He's a boy: they hate this sort of thing. It's for his own good.
This may get tricky.