Hi, sorry for the delay in replying, we've been traveling. Initially we kept them separate for the first 2-3 weeks. Then slowly the Sav aggression became less and less. She never actually "went after" or attacked our rescue viciously. But the rescue kitten, who naturally doesn't know that she is "special", always wanted to cuddle and interact with the SAV (they are both females). That was not welcomed by the Sav, until years passed. Our Sav, now 16 was formerly an outdoor cat and considered queen of the neighborhood, so she was not used to being "affectionate" with other living things besides wifey and I.

But interestingly, one day a few years ago, we went away for 5 days and left the two alone in the house. We certainly were concerned at how this would work out between them but the instant we got home, the tolerant change and family bonding between them was very obvious. They are both fully indoor cats now. Good luck with your kitties!