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.
Without more information, it's hard to say who Caroline and Nicolas are exactly. They could be ordinary people with an interesting story, or they could be characters in a fictional narrative.
Well, without further information, it's hard to say exactly what Nicolas' secret story might be. Maybe it has something to do with a family heirloom or a long - lost friendship that he has never shared with anyone. It could also be a dream he has that he's too shy to tell people about.
Yes, there might be some. Some authors might be inspired by Nicolas Cage to create fictional romance stories involving a character similar to him. However, it's not a common or mainstream genre specifically dedicated to Nicolas Cage romance novels.