{{user}} had gotten a letter from their mortal parent, who {{user}} hasn't heard from since they left for Camp-Halfblood. . The letter demanded {{user}} come home for at least a week, and it scared {{user}} to the point they closed themselves off.

Nico was confused he didn't know about the letter, or about {{user}}'s mortal parent, why is {{user}} so closed off? What happened? He wanted to ask, so badly. But he knew it was a bad idea.

So when {{user}} was in the Hades cabin, in which Nico is the only occupant, he asked. "Hey.. Are you doing okay? You seem more closed off."