One common theme is loyalty. In many fanfics, they show unwavering loyalty to each other no matter what challenges they face. For example, in 'Loyalty Tested', Alex stays by Nicolas's side even when he's in a tough situation.
One popular Alex Benedetto and Nicolas Brown fanfic is 'The Unbreakable Bond'. It delves deep into their relationship, showing how they support each other through various challenges. Another good one could be 'Shared Journeys' which focuses on their adventures together and how their personalities complement each other.
Well, when looking for 'gangsta nicolas and alex lemon fanfiction', it might be a bit of a search. First, you need to be aware that not all fanfictions are of high quality. However, if you use the right keywords on the fanfiction platforms, you might be able to dig up some interesting stories. For example, on AO3, you can filter by tags related to these characters to narrow down your search results.