Well, Paul might be really shocked at first. Percy could show him some of his demigod powers, like controlling water. Paul, being a normal mortal, would be super amazed and probably a bit scared too.
It could be a new monster that is specifically targeting Percy's mortal connections, like Paul. Maybe a monster that feeds on the fear of mortals who are close to demigods.
In this fanfiction, perhaps Paul Blofis, being Sally's husband, could offer Percy some fatherly advice. He might share his own experiences and wisdom with Percy, which could help Percy in dealing with his own complex life as a demigod. Percy, on the other hand, could introduce Paul to the magical aspects of his world, like the existence of Camp Half - Blood and the different gods.
Paul might be characterized as the voice of reason. In a world full of chaos and mythical beings, he can be the one who tries to find logical solutions. He could be a bit of an amateur detective in the fanfiction, using his teaching skills to research and figure out things related to the demigod world. Also, his relationship with Sally gives him a deeper connection to Percy and a motivation to be involved in the demigod's life, so his protective side towards Percy can be emphasized.
It could be a new monster that is after Percy. Since Percy is a demigod, there are always monsters chasing him. This new monster might be something that Paul has never seen before and it could put both of them in danger.
One idea could be that Paul discovers Percy's true identity in a really unexpected way, like during a school field trip to a museum where a mythological artifact comes to life. Another could be Paul and Percy teaming up to save Sally from a new threat that has ties to the Greek underworld. Maybe Paul gets dragged into a quest by accident and has to quickly learn about the demigod world.
Well, Paul Blofis could be really curious about Annabeth. Maybe he asks her a lot of questions about her life at Camp Half - Blood. He might be amazed by her intelligence and skills.
In a 'Paul Blofis meets Poseidon' fanfiction, it's possible that Poseidon would appear to Paul in a dream first. He could give Paul some cryptic messages about Percy's future. Paul, being a mortal, would struggle to understand at first but then slowly start to piece things together. And when they finally meet in person, there could be a tense exchange as Paul tries to stand his ground in front of a powerful god.
He could interact with them in a very friendly and awestruck way at first. Like he's constantly asking questions about their powers and adventures, and the Avengers are amused by his enthusiasm. For example, he might be star - struck when he meets Iron Man and keeps asking about his latest suit upgrades.
In a 'Percy Meets Paul' fanfiction, Percy could be a demigod, like in the Percy Jackson series. He has powers related to the Greek gods. Paul, on the other hand, could be a normal human who is very intelligent and curious. Their meeting could be a chance encounter, like Percy accidentally stumbling into Paul's life while on a mission. Or Paul could be someone who has been unknowingly drawn into Percy's world of magic and mystery.