Without a literal voice, Percy wasn't everything we know him to be. He's a great fighter. He's an amazing person. But people think he's rude because he doesn't talk, and he's also not elected leader of Camp. But rather, he's stuck in his head a lot. Thinking, mainly about the fact that if ever came out as what he really is- gay, he'd lose all of the very little he had. For Nico di Angelo, the very talkative little brother of Bianca di Angelo, it frustrated him that Percy never talks. Nico is openly gay, and will admit to having a small (not) crush on the son of Poseidon. I mean, who could blame him, right? At least he wasn't afraid to admit it, unlike a certain demigod.
5 parts