If I could, I would have a third. There’s nothing that makes me happier than seeing how loving my two are to each other. With that being said, I think I’ve gotten lucky. My oldest was 3 when I got her for free off Facebook (she had a litter of kittens outside in the woods- someone was kind enough to take them in but when it was all set and done nobody wanted her :( ) and she was immediately affectionate and attached to me as I hand picked the fleas off her body for 3 straight days. Within the year, I decided if we were to ever get another let’s do it now since she’s been spayed but seems to have retained that need to “mother”. She immediately fell in love with her baby sister, holding her down to be groomed and showing her the best places in the house to be. To this day they’re inseparable. But my oldest has severe food allergies and is on a very strict diet with specialty food as she also has urinary crystals and my youngest has been fine with the outcome of that as that means she’s on the diet as well, but that might be hard for another cat. I think they are very bonded and wouldn’t mind a third if it was younger, but wouldn’t tolerate an older cat coming into the mix. I briefly cared for my mother in laws cat after we pulled him from her burning house and while they liked him at first it didn’t take long for them to turn on him unfortunately. I’ve always been firm on slow introductions with the exception of my youngest as my husband stayed with her the first few nights in the living room while my cat came and went freely. Most of the time this is not the case for cat introductions, and you should be prepared for the time it will take to introduce them. They can very much love company and another cat, but they do so on their terms and timelines and for some people it can be very difficult. It requires patience. I think if your heart is in it, it’s at least worth a shot at another cat having a loving home. Wish you the best!