I've introduced new kitties to my exisiting "kitter katter" tribe... but it has always been a kitty to older cats.. In the beiginning.. they kinda like to have their own litter box... somehow.. that seems to be a "thing"...

I've always brought the new kitty out and held it.. and the older kitty katters come out and start "checking" the newbie out.. while she is safe...my experience has been that they start "gooming" the new kitty.. licking and such...and then it is just "ok"... haven't really had a "rejection"....

and yes.. I admit to 4 kitty katters.. but.. that was a longtime ago.. alllergic now..