Rumble has to fly down from Cloudsdale to PonyVille and do some errands, some of which were Thunderlane's tasks in the first place. However, his couch potato of a big brother is reluctant, leading the diligent colt to take matters into his own hooves. Rumble doesn't have the slightest ounce of worry in his mind, but he should: His toned pecs aren't ready for the world to see yet. Aged up Rumble, meaning that he is of teenage age. INNUENDO. Title changed because there is another story out there that has the word mare-magnet in the title. :(