It could be friendly. Paul might be friendly and welcoming towards Annabeth, seeing her as an important person in Percy's life. He could offer her a place to stay if she needs it in the mortal world.
The interaction could be intense. Imagine if Annabeth is on a mission in the mortal world that somehow involves Paul. Maybe she needs to protect him from some monsters that are after Percy's family. Paul would be really confused at first, but Annabeth would be all business. She would quickly explain the situation to him as best as she could, and they would have to work together to survive. During this time, they would see each other's strengths and weaknesses, and their relationship would be forever changed.
Their interaction might be a bit awkward at first. Paul is a mortal, and Annabeth is a demigod. They come from different worlds. But as they start talking, they could find common ground. For instance, they both care about Percy. Paul as his stepfather and Annabeth as his girlfriend. So they could gradually start to understand each other better and become friends. Paul could learn about the demigod world from Annabeth, and Annabeth could learn more about Percy's mortal life from Paul.
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.
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.
Paul might be a bit intimidated at first. He's just a mortal, and Poseidon is a powerful god. But he might also be curious. After all, he loves Percy, and Poseidon is Percy's father. So he could start asking questions about Percy's heritage and what it means for Percy's future.
A great way to develop their relationship is through a shared hobby. For example, if they both like gardening, they can work together in the garden. As they plant and tend to the plants, they talk, laugh, and gradually grow closer. This simple activity can be a starting point for a deeper emotional connection in the fanfiction.
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.
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 specifically targeting Percy's mortal connections, like Paul. Maybe a monster that feeds on the fear of mortals who are close to demigods.
Perhaps in this fanfiction, Paul Blofis is a scientist who has been studying the Avengers for years. One day, he discovers a connection between the Avengers' powers and a strange energy source. This discovery attracts the attention of both the Avengers and their enemies. So, the Avengers bring him into their team to help them understand and protect this energy source from falling into the wrong hands. He has to adapt to the superhero life quickly and contribute his scientific knowledge to the team's battles.
In the fanfiction, Gildarts could meet Natsu and Igneel during a time of crisis. Maybe their town is under attack. Gildarts would immediately jump into action, and Natsu would follow suit, with Igneel guiding Natsu from the side. Gildarts might be impressed by the way Natsu and Igneel work together, as if they share a single mind. They could communicate without words, and Gildarts would try to learn from their unique bond. After the battle, Gildarts would offer to train Natsu further, seeing his great potential enhanced by his connection with Igneel.
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.