Hello! I have mentioned before that I brought home a kitten (Bug) and I'm currently introducing her to my resident cat, Izzy who is 3. I have kept Bug isolated for a few days then let her out a few times a day when izzy is hiding or in the basement. A few days ago we started feeding them together and playing with them together. It's been going well in my opinion, Bug is eager to be friends with izzy but izzy is timid and hisses at Bug if she gets too close, but doesn't try to attack her or run away from her. Today they played together, ate and then were in the same room together, izzy approached Bug and sniffed her and Bug hissed at her. Izzy seems still scared of bug a little but there is not really any aggression. Is this good? I want some opinions other than my own. Also, what should my next steps be?