His friends would first be really concerned. Annabeth would be in her problem - solving mode. She'd try to analyze the symptoms, not just the sneezing but also any other signs of Percy's sickness like his temperature or any strange marks on his body. Grover would stay by Percy's side, constantly offering moral support. He might also use his empathy link with nature to see if there are any plants that could help. Leo would likely try to invent some sort of device that could either stop the sneezing or figure out what's causing it, while Piper would use her charm - speak to try and soothe Percy when the sneezing fits get really bad.
Well, Percy's friends would have a range of reactions. Annabeth would be the most organized. She'd make a list of possible causes of Percy's sickness and sneezing, starting with any recent encounters with monsters or strange magical items. Grover would be very empathetic. He'd feel Percy's discomfort and would do whatever he could to ease it, like bringing him fresh air by taking him to a nice spot in the forest near the camp (if Percy was well enough to move). His other friends like Hazel would use her knowledge of the Underworld and the strange things that lurk there to see if there was any connection to Percy's current state. They'd all be worried and would work together to try and get Percy back to health.
In this kind of fanfiction, one scenario could be that Will Solace uses his healing powers to try and cure Percy. He might be really worried as Percy is not only his friend but also someone he cares about deeply. Maybe he brings Percy to the infirmary in Camp Half - Blood and stays by his side, constantly checking on his condition and using his medical knowledge and powers to make Percy better.
Annabeth would probably be very worried and take charge. She'd start researching immediately, looking through books in the camp library to find a cure. Grover would be constantly by Percy's side, using his nature - related powers to try and make Percy more comfortable, like bringing in fresh air and plants to help him feel better.
One idea could be that Percy's sneeze accidentally triggers some sort of magical reaction. For example, it could cause a mini - tsunami in the middle of Camp Half - Blood because his powers are all jumbled up due to his sickness. Another plot could involve Percy sneezing and accidentally revealing his location to some monsters who are on the hunt for him while he's weakened by the illness. Maybe his friends have to figure out a way to keep him hidden and also cure his sickness at the same time.
Perhaps Percy would try to understand the primordial's reasons for the betrayal. He's a smart and empathetic character. He might think that there was some misunderstanding or that the primordial was forced into it. So, instead of immediately retaliating, he could try to communicate with the primordial to clear things up. If that doesn't work, then he would be more likely to take a defensive stance rather than an offensive one, at least until he fully understands the situation.
Well, maybe Percy could be poisoned by a monster in disguise at school. He starts feeling really sick, like having a high fever and being super weak. His friends, like Annabeth, suspect something is wrong and start investigating. They might find out that there's a new threat in the school that's targeting demigods.
The relationship between Percy and Will could develop in interesting ways. Since Percy is sick, he might be more reliant on Will, which could make their connection deeper. Will, on the other hand, would be determined to make Percy better not just because he's a healer, but also because he values Percy as a person. It could be a story of friendship and loyalty in the face of illness.
His sneeze could be related to his demigod abilities in a more defensive way. Suppose an enemy tries to use a spell or attack that targets his water - based powers. His body could automatically react with a sneeze, which releases a small burst of water - like energy that deflects the attack. It's like his body's natural defense mechanism using his demigod powers in an unexpected way.
The main characters would surely include Percy. Then, there could be Tyson, Percy's half - brother. Tyson could be really worried about Percy and use his strength to protect him while he's sick. Also, Chiron in his disguised form as a teacher at the school could play a major role. He has a lot of knowledge about demigod illnesses and could guide Percy's friends on how to help him.
Well, it could be that the sick person has a unique power that is making them ill. Percy and Will have to figure out how to control or suppress this power while also treating the illness. Maybe the power is related to a prophecy that they need to fulfill. So, not only are they trying to save the person's life, but also trying to understand the bigger picture of what this all means for the world of demigods.
One common theme is the vulnerability of the characters. Percy, who is usually strong and heroic, becomes weak when sick, showing a different side of him. For example, in many fanfictions, he might struggle to even stand up or use his powers.