Rumble has a latex fetish suit. He has a psychic link to that suit. The suit can fuse into the body of it's wearer, and change it's appearance. Whoever wears the suit is Rumble's sex puppet. Scootaloo puts the suit on. Chaos ensues.
I'm just a simple guy who loves reading (mostly MLP fanfics) and hopes to be a good writer myself someday and, hopefully, also get involved with music somehow (notice the microphone cutie mark).