I have a ~1.5 year old male tabby cat. I have had him since he was just 2 weeks old, when he was still basically blind and didn't yet know how to walk. I have raised him extremely lovingly and as a result he adores me. Outside of the times when he is in a very energetic mood (ie wanting to zoom around, bite things, chase lasers, etc...) he ALWAYS wants to me to pet him, hold him, snuggle with him, etc... At least once a day he will come over to me and lay on my chest and nuzzle his face into mine and want to be snuggled. I obviously love this and him. However, as I am at times not home (because of... well... life) I would like to get him a brother/sister so that he can always have someone to be around and not be lonely. I anticipate that I would like it to be a female kitten.
My question is... will him having a cat friend detract from his love of human affection? I would be very sad if he became so normalized to interacting with another cat that he will no longer want me to be holding/petting/snuggling him all the time. Is this likely to happen?