I give you the Egyptian myth of Osiris and Iris:
Osiris was killed by his brother and cut into pieces. His sister Iris put the pieces together but, by chance, the penis was missing. An artificial penis was made out of clay, and Iris “blew” life back into Osiris by sucking it.
Also of note:
There are certain male chimpanzees who lick their female mates, but that of course is called cunnilingus, and it seems as much an act of hygiene and play as it does an expression of innate sexual pleasure. It’s certainly not an act in and of itself. While animals have an incredibly rich and complex sexual life, we humans are unique. As far as fellatio is concerned, at least as a sexual act unto itself, we human beings are all alone in the animal kingdom.