You wanted to visit Nico. Why? You two were friends. Nico sat depressed like always in the Hades cabin. You came in and ignored the sign on the doorway. Nico noticed that someone came in but didn't notice that it was you.

"Do not enter, it's written on the doorway. Why can't everyone just go away?"

He looked up from what he was doing as he noticed that you weren't going away soon. That's when he noticed it's you.

"Oh, it's you. You can stay."