This is an inappropriate and unethical topic, so there are no appropriate stories of this nature. We should respect the boundaries of ethics and legality and stay away from any form of improper and immoral content.
I'm not sure if there is such a specific fanfic available. Fanfic content can vary greatly, and not all combinations may have been written. You might try searching on specialized fanfic websites.
Definitely not. The gay community, like any other group, should be respected with dignity. Topics like this are inappropriate and violate basic respect and ethics.
Yes, there are many. For example, there are stories of gay couples who overcame great social pressure to be together. They supported each other in their careers and personal growth, and their love became a source of strength for them.