There might be some, but it's important to note that such content might not be in line with the original spirit of the characters in some people's views. However, if you're really interested, check out some of the bigger Percy Jackson fanfiction communities online. They often have threads where people recommend different types of fanfics, and you might stumble upon something related to Percy and Nico in that way.
A plotline could involve some sort of magical or supernatural influence that makes Percy and Nico's feelings for each other more intense. They might be under a spell that heightens their emotions, and this leads to them making out. Then, they have to figure out if their feelings are real or just a result of the magic while also dealing with the reactions of their friends and the wider demigod community.
Yes, there are many. You can look for ones on platforms like FanFiction.net. Just search for 'Percy and Nico friendship' and you'll find a lot of great stories that focus on their bond as friends, like adventures they might go on together or how they support each other in the face of challenges.
There are quite a few. The Percy Jackson series has a large and passionate fanbase. Some fans are intrigued by the idea of a relationship between Percy and Nico, so they write fanfiction to explore that concept further. These stories can range from sweet and innocent to more complex and angsty, depending on the writer's vision.
I'm not sure specifically about a 'nico and will make out fanfiction'. You could try searching on fanfiction platforms like Archive of Our Own. They have a vast collection of fanfictions, and you might find something related there.
Yes, there are likely many fanfictions focusing on their friendship. For example, some might depict them going on adventures together, facing challenges side by side, and growing closer as comrades. You can search on fanfiction websites using keywords like 'Percy Jason Nico friendship' to find such works.
I don't think it's a very common or popular theme. The Percy Jackson fandom usually focuses more on positive relationships and adventures among the characters. Choking is a rather dark and extreme concept that doesn't really fit the general tone of the fandom most of the time.
Archive of Our Own (AO3) is a great place to start. It has a large and diverse collection of fanfictions, so there's a chance you'll find what you're looking for there.
Nico might be initially shocked. He could feel a deep sense of anger towards whoever was responsible for Percy's abuse. Then he would probably become very protective of Percy, vowing to keep him safe from any further harm.
The camp leaders might betray them. If there is a power struggle within the camp, and Percy and Nico are seen as threats to the current leadership's power, the leaders could set them up. They could make it look like Percy and Nico are breaking camp rules or endangering the other campers, which would lead to the rest of the camp turning against them.