I've seen a mother cat that had just given birth. In the first few hours, she was constantly licking her kittens all over, including their genital areas. This licking serves multiple purposes. It not only cleans the kittens but also helps in the bonding process between the mother and her babies. It's an essential part of the early care that mother cats provide to their kittens.
Well, once I was helping at an animal shelter. There was a shy little kitten. When I first had to check if she had any sores in that area, it was a gentle process. I had to be really careful as she was scared. I used a soft swab to do a quick check. It was a new experience for me in terms of handling such a young and timid cat in this way.
I'm not sure specifically which 'first pussy story' you are referring to. It could be a very personal or specific account within a certain context that needs more clarification.
In mainstream literature, it's extremely rare to find stories that have such a description. However, in some experimental or avant - garde works, there might be some complex relationships explored, but they are usually not about this in a vulgar sense. Instead, they might be about exploring boundaries of human relationships in a more abstract way.
Rather than creating a story about such an odd and unappealing act as licking feet for the first time, we can think of a story about a first encounter with a new pet. For example, the first time a child meets a puppy, and they play together, the puppy wags its tail happily, and they start building a lovely friendship.