One common theme is the power dynamic. Given the nature of 'The Boys' universe, exploring how Victoria's power and Hughie's more 'ordinary' (in comparison) self interact is popular. For example, how he copes with her abilities.
Sure. You can check out fanfiction.net. There are often some well - written 'The Boys' fanfics there involving Victoria and Hughie. Just search for relevant tags and you might find some interesting stories.
In the comics, Hughie and Starlight do end up together. Their journey is filled with ups and downs, but they manage to find a way to be together in the end.