The main conflict could be Merlin's struggle between his loyalty to Arthur and his duty to the magical community. He loves Arthur and wants to protect him and Camelot, but he also has a responsibility to the other magic - users who are often persecuted.
One possible main conflict in this fanfic could be Merlin's internal battle regarding secrecy. He has to keep his magic a secret from most in Camelot, but there may come a time when revealing it could save many lives or prevent a great disaster. So he's stuck between the need to keep the secret for his own safety and the potential good that could come from revealing it, which is a classic 'between a rock and a hard place' situation.
Perhaps the main conflict is Merlin having to choose between two different paths that both seem right in a way. For instance, he might be presented with an opportunity to gain more power to better protect Camelot, but the cost of that power could be his own humanity or his relationships. This would put him in a really tough situation, being between a rock and a hard place as he tries to decide what's truly important.
Well, in such a Merlin fanfic, it might show Merlin being forced to make a tough choice. For example, if there's a threat to Camelot and the only way to stop it is by using a form of magic that is considered dark. He's between a rock and a hard place because using the magic could turn people against him, but not using it would mean the destruction of Camelot. This type of story can add a lot of depth to his character and show the moral dilemmas he constantly faces.
The main theme could be about difficult choices. The title itself implies being stuck between two tough situations, so the novel might revolve around a character having to choose between two equally unappealing or challenging options.
It's possible that the main character is a lone figure, like a detective or an explorer. They might be in a situation where they are trapped between two powerful forces, such as two rival gangs or two different political factions. Their struggle to stay alive and solve the mystery or complete their exploration while being caught in this dangerous situation could be what the novel is about.
Another theme might be self - discovery. The difficult situation could have forced the boy to learn more about himself, his strengths and weaknesses, and in the process, he was able to overcome and achieve success. For example, if he was in a situation where he had to choose between two different career paths that were both challenging, through that process of decision - making and struggle, he discovered his true passion and was able to succeed in that area.
It's possible that Adrian is trying to catch Rivky and Amu because they have something he needs. This could create a conflict as Rivky and Amu might not want to give it up easily. For example, if it's a magical object or a piece of information that is important to them. So the struggle between Adrian's pursuit and their resistance forms the main conflict.
Perhaps the main conflict could revolve around the prince's internal battle. His anxiety makes it hard for him to trust his logic when dealing with moral issues. Say, there's a situation where the prince has to decide whether to go to war for moral reasons (like protecting the innocent in another land) but his logic tells him the cost in lives and resources is too high. His anxiety then amplifies the struggle between what he feels is morally right and what seems logically sound.
A husband, say, Dave, had a boss, Mr. Garcia. Dave was a creative person and often came up with new ideas for projects. But his boss was very traditional and didn't like to deviate from the old methods. One time, Dave presented a new marketing plan that he thought would be great for the company. But Mr. Garcia immediately shot it down, saying it was too risky. This led to an argument between them. Dave felt unappreciated and Mr. Garcia thought Dave was being reckless. It took a while for them to reach a compromise where Dave could test his idea on a small scale.
It could be Morgana. She might see Merlin's transformation into a dragon as a threat to her own power and plans. So, she tries to stop him from fully becoming a dragon or tries to use his new form for her own evil purposes.
In fanfics about their friendship, their contrasting personalities play a huge role. Arthur is the proud and noble prince, while Merlin is the bumbling yet powerful servant. This contrast leads to some really interesting and humorous situations. They start to understand each other better over time. Merlin learns about Arthur's responsibilities as a future king, and Arthur begins to see Merlin's loyalty and the value of his unique abilities.
I'm not sure specifically which 'rock hard cock story' you are referring to. There could be many fictional or personal accounts that might use such a phrase. It could potentially be a story about a very determined or unyielding character, but without more context, it's hard to say.