Of all the straitlaced demigods, Persephone could have hardly chosen two that were more so than Nico and Hazel. Despite their youth, both of them came from a time period when bathing suits were entire bathing trunks, and they'd retained that sense of propriety. Nico could happily go through his entire life without seeing his stepmother or his sister in a modern swimsuit.
He was glad when the conversation moved away from swimming, although he couldn't help but be a little suspicious about the food that Persephone was offering. The invitation to her little grotto was probably the nicest thing Persephone had ever done to him in his entire life. And now she was offering food? Especially when it was food that was responsible for her being stuck in the Underworld?
"I'm not really hungry, thanks," he murmured. And anyway, he had yet to really get his appetite back. Being trapped in a giant vase with no food or air for a few weeks had a way of tampering with one's appetite.