Cloudsdale's secret

One day, a perpegus falls out of the sky, and Rainbow dash is the first one to meet it. Her other friends help her deal with the perpegus, named Cloudglider. Cloudglider is taller and older than Rainbow dash, with more knowledge to carry. She follows orders from Rainbow dash. In time, another perpegus joins them and Rainbow dash freaks out. Will she be able to handle them?

*this is kinda like a mlp version of heaven's lost property.*