Headcanon: When Will and Nico started dating...
Will had to face a lot of people who had become protective of Nico decided to have a little chat with Will.
Will never looked at Hazel the same way again. Her domain was riches so a lot of people forgot that she could control the dead too. Will never forgot again.
Will had a hard time taking Percy seriously though - he seemed more focused on the fact that he wasn’t his type and the boy was like a five year old when he pouted.
Will had to stop himself from awing at the adorableness of Franks attempt to threaten him but then again once he got on the topic of if Nico gets hurt that will hurt Hazel and…well Will remembered he was a son of Mars
Annabeth never actually said anything but one day she came to archery practice and stared at Will. Nobody had ever seen a child of Apollo miss so much. He finally looked to her and went to say something when her eyes narrowed. Will gulped and Annabeth walked away with a smirk. He avoided her for a few days
The two most protective were Jason and Reyna. Ever since Cupid Jason has forced himself into Nicos life until eventually he became his best friend - though Nico would rather go through Tartarus again than admit it. So Jason had a nice long chat with Will. Will still thinks the lighting was a bit much though.
As for Reyna - the two had bonded as siblings over their trip and so she was extremely protective of him. She was even scarier than Annabeth - something nobody at camp had thought possible
The most surprising person though was coach hedge. Apparently almost seeing him fade into shadows had made him rather protective of Nico. The sight of the satyre chasing Will through camp with a baseball bat was something nobody at camp would ever forget
Nico had been helping his dad when all this happened and when he found out about it when he got back he was beyond embarrassed and exasperated. Secretly though he was touched to realize he had so many people who cared about him