DeRosa's book is also good classic for basic FX options. I remember he came down from Yale to the Hedge Fund Capital to meet me and Taleb...(looong time ago)
The best book to learn FX options is to sit next to someone managing a book of FX options. And size matters, demand and supply for options themselves, you cannot delta hedge away all the risk all the time....not even close to...
what about Dynamic Hedging
Taleb, quite some FX there, and yes not so different from equity..
and yes Wystup's