I have found that people are most interested in the things they know the least about. One of my most popular posts is ‘How to write characters with dyslexia’ in which I try to help people better understand what dyslexia effects in my life. It was not until just a moment ago that I realized I had another type of character that people were still fascinated by… Gay ones. So here we go, this is my number one and most important tip.
It is exactly the same as writing straight fiction.
When you are writing the actual romance, falling in love is the same for all types of people.
What is different is how the world reacts.
Once upon a time, I wrote a gay romance and the person who read it misread all the pronouns to make the main character a girl. It works for me, they liked the novel they just weren’t open enough to LGBT ideas for me to correct them.
So that is my footnote on how I suggest you write gay fiction- the same way as everything else.