Very cool. Both of them seem to really like the other one a lot.
We had some concerns when we recently adopted Daisy because Chewy and Lucky have been best friends for years and we didn't know how they would take to a new cat, but I have to say she has been good for both of them. She is still in that kitten stage, attacking everything in sight and always into something, and she has given them both much needed exercise. Chewy and her play all the time and Lucky has to keep an eye peeled so he doesn't get pounced on. I see both of their health much improved and they are much more energetic.
Don