After losing their power, the sirens find Equestrian magic enabling them to put animals under their spell, and use this to exact their revenge on the girls that defeated them.

Another departure from what I usually write. Part of it is a parody of 101 Dalmatians that was sort of requested. Ironically a sort of reversal of sides.

It may be a lot cleaner, but don't expect too high quality. Just a short story that could have been a single episode.