Long story short, Will had pissed Meg off in some way.

And now, the son of Apollo was outside the Hades Cabin, shivering like he just took a cold bath. He was hoping Nico would answer, considering the... Situation he was in.

Nico did answer, coming face-to-face with Will Solace with... Cat ears and tail?

Will chuckled awkwardly. "U-Um... Long story..."