I hate ‘humanising’ animals, but my two cats - now over a year old - really do seem to have a very close bond. They still sleep together all the time, groom each other, eat together, I even see them from the window out and about roaming together. When one of the meows ( both vocal breeds) the other jumps up and goes to find them.
It’s quite touching to see - particularly as if always very much thought of cats as only really tolerating other cats.
I hope it last!
Sorry just random kitty musing ....