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.
Well, first, think about what kind of story you want to tell. Is it a fictional adventure, a real-life event, or something else? Then, break it down into a clear beginning, middle, and end. Also, pay attention to your language and try to make it interesting and easy to follow.
Common themes could include elements of forbidden desires or exploring unconventional sexual fantasies. But keep in mind, such content is often restricted and not suitable for all audiences.
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.