Aw poor Iggy! Wanting attention from Simba so bad and getting the smackdown. I feel so bad for him just picturing that.
Aside from that, wish I could tell you more but the only thing I can tell you is my own experience. When I was nineteen, I got two cats, Emanon (boy) and Miss Grace (girl). They were from the same litter and adored each other. Then I found Snow, another male hanging out at my apartment complex and took him in. At first they all seemed to tolerate each other then Miss Grace went into her first heat and out came the claws. Emanon and Snow saw each other as big time rivals. I ended up getting all of them fixed but the boys never got along after that. Several months of desperation later I went back to my vet and asked if there was something I could do to stop the fighting. He chuckled a bit once I described it all and then said basically that my cats didn't like each other, just like some people don't click, and there wasn't much I could do about it. He did suggest giving them each their own space however, as he thought some of it was due to the fact that my apartment was so crowded.
Eleven years later and Miss Grace, along with several other cats, has come and gone but Snow and Emanon still hate each other. They're too old to fight all the time but they avoid each other and will have a small smackdown over dinner and who eats first at least once a week. I generally have to feed them separately. They've learned to live with each other though and they allow each other their own space. In our new place, Emanon has the bedroom and Snow has staked out the sofa, so we're all content.
It's probably just going to take a long time. Simba may be hoping that the 'intruder' will eventually go away. It may take a lot longer for her to get used to the fact that the little one is home to stay. They'll either start getting along or find a way to live with each other regardless, most likely. Hope things work out for your stressed kitties soon-keep us updated!
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Miss Grace, Normie and Cleo, you will never be forgotten.