You promised you would protect her Nico said.
He might as well have stabbed me with a rusty dagger.It would've hurt less than reminding me of my promise.

Images flashed through his mind. He saw Nico and his sister on a snowy mountain cliff in Maine, Percy Jackson protecting them from the manticore. Percy's sword gleamed in the dark. He'd been the first demigod Nico had ever seen in action. Later at Camp Half-Blood, Percy took Nico by the arm, promising to keep his sister Bianca safe. Nico believed him. Nico looked into his sea-green eyes and though, How can he possibly fail? This is a real hero.

I had a crush on Percy," Nico spat. "That's the truth. That's the big secret.

Percy is the most powerful demigod I've ever met. No offense to you guys but it's true.

Don't talk to my sister that way." Nico said. His voice quivered, but I was impressed that he had the guts to say anything at all. — Percy

Nico di Angelo ran up to me with a big grin on his face.
"Percy, this is awesome!" His blue-feathered bronze helmet was falling in his eyes, and his breastplate was about six sizes too big. I wondered if there was any way I'd looked that ridiculous when I'd first arrived.