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.
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.
There should not be such stories in literature. Literature has a role in shaping society's values. It promotes things like love, friendship, and the growth of characters in a positive and ethical framework. The idea of an 'old woman giving handjobs to boys' is not only inappropriate but also violates moral and ethical boundaries that literature adheres to.