I think this worked!
Leo: It smells like... other kitties!
It's even Star approved!
Star: Hmm, yes, I can see this as my throne..
The fur you see on it in Star's picture is all them... that's after it was totally vacuumed up! She waits for me to put it in it's spot and is on it immediately. Leo comes down later and when she gets off, it's all his! Then they go back and forth all day and night. I think they kinda like it..