Amazing, the tenth time.
Aerie isn't the only one in need of wings, there are succubi to keep you entertained in Watcher's Keep. They would look much better this way than as sirines.
-Galactygon
On a similar vein, this could be used to create an Erinyes, or some different devas (IIRC, the current devas use the same animation as the planetars/solar).
Charles