First of all, thank you for the non-judgemental reply, other forums have really made me out to be some kind of monster for even considering this, when all I want is to do something good for the one friend I've had growing up.
My siblings had a younger kitten at some point, not sure of the exact...
Ok, backstory is kinda long, but I hope it makes sense!
I've had my cat Finnie since I was about 12 y/o, so for almost 9 years now. She was only a few months when I got her, so I'm all she really knows since I was her main person. She's fine with other humans, but she will not allow another cat...