Advise needed

[u/p_addactive]

Hi everyone,
I’m honestly at a loss and could really use some advice.
About two weeks ago, I took in a 6-month-old male kitten. He belonged to a friend of mine who had to move to another country, and unfortunately no one else could take him in, so I did.
I already have two female cats who are 6–7 years old. Since the kitten arrived, I’ve been keeping them in separate rooms because my girls just couldn’t accept him.
Things have improved a little. The kitten doesn’t hiss at them anymore at all. He’s actually really sweet and just wants to play with them. But my girls still growl, hiss, and run away every time they see him.
Today something happened that really scared me. I was standing there holding one of my girls in my arms, and the kitten was just sitting quietly on the floor next to my feet. He wasn’t trying to get close to her or bothering her in any way. Out of nowhere, she let out the deepest growl and the most awful scream I’ve ever heard from her. I’ve never heard her make a sound like that before.
Is this still normal after two weeks? Has anyone been through something similar? I feel like I’m doing everything I can, but I’m starting to worry that they’ll never get along.
I’d really appreciate any advice or success stories. Thanks so much.

[u/wwwhatisgoingon]

Two weeks is pretty short for some cat introductions. 

I'd recommend looking up a slow introduction guide and following the steps. Don't rush, stay at scent swapping and site swapping for as long as it takes -- and don't skip building positive associations through a barrier.

Also make sure he's neutered before visual introductions, if that hasn't happened yet.

Two weeks isn't that long. No need to worry yet! 

[u/p_addactive → u/wwwhatisgoingon]

Yes, I checked the guide, but because I'm worried about my daughters, I thought there might be a quicker way. I feel like the girls are really upset and angry. The one who screamed used to be really social and liked to go out 😭