An Immortal Diversion

When Poseidon finds out that Nico had a crush on his favorite son, he has no choice but to send Hermes down to the Underworld to figure things out. Of course it doesn't end up going so smoothly, and Poseidon ends up showing in the Underworld with a face-to-face chat with Hades, his brother about a subject neither one of them really wants to confront.