In answer to her question, Triton simply smiled and moved to the door, exiting first so she could lock up behind him. “I’d rather not say, and have you see for yourself. I promise you, it will be a pleasant surprise.”
This explanation was perfectly true, and it ensured that Triton didn’t have to say anything about Amaterasu beforehand. Triton much preferred having Athena meet her without anything he said present in her mind.