Hello!
My first cat Tazi was an alone cat for 4 years, until I introduced Nuggie a 5 week old "Alien". Tazi was neither impressed nor happy with this and he wasnt scared to show it.
Tazi didnt enter the living room for 2 weeks, the 3rd week was spent at the living room door spitting. He beat Nuggie up and I never left them alone after that until Nuggie was a little older.
I feared Tazi would never accept little Nuggie, it really wasnt looking good until one day I walked in and found them like these photo's!!
It just took time, our patience, a cheeky kittens persistance, a pecking order understanding and the results are often good! Nuggie is 9years old now, Tazi sadly passed, but Nuggie still went for grooming right up until Tazi passed. Tazi often batted him on the head as if to say "grow up boyy!" but patience is the key and the older Cats will put the kittens in their place with a good telling off and then take care of them. It worked for me anyway!!
xx