This is a weird tale, but I promise it is true.
My cat Skooter, the sweetest, most pillow-like, amiable tomcat in the world, went out one day and brought home a kitten.
Let me repeat, this is a neutered male cat.
He bathed the kitten.
He carried it around in his mouth.
He NURSED it!
I'm sure nothing came out, but his little nipple got hard and stuck out and they did all the little pushing with the paws thingy that kittens do when they nurse.
Although Bitty has since grown up and been "weaned" they still enjoy a cuddle.