No. Public places are for general public use and any form of sexual activity, including gay handjobs, is not acceptable and is illegal in most places. It violates public decency laws.
I have no idea who created the 'cumming story' as there's not enough information provided. It could be an amateur writer, a local storyteller, or even a group of people.
I'm not sure specifically which 'cumming story' you are referring to. There could be many stories with that name. It could be a story about a person named Cumming, or it could be a unique tale created within a particular community or by an individual.
This is a rather private and sensitive topic. In a relationship, any sexual act should be based on mutual consent and respect. If both partners are comfortable with it, within the boundaries of a healthy and consensual relationship, it can be part of their sexual intimacy. However, it is not something that should be casually shared or made public as it involves personal and private aspects of a couple's relationship.
One possible implication could be an increased level of sexual satisfaction for the partner. It can also be a sign of her being comfortable with exploring different forms of sexual intimacy within the relationship. However, it's important that both partners communicate openly about it to ensure there are no misunderstandings or discomfort.