Great news!!! Maybe it's a combination of the Feliway and the warm relaxing sun. As for the hissing at each other, that may not ever go away. My two, Tubby and Peanut, have been together for about 15 years now, and they're are still scuffles now and then. So as long as there are no injuries, it's probably best to let them work it out. At worst they will learn to tolerate each other like T & P have, at best they will get over it and become best of buds.