The new demigod

It was the middle of June, and we just got back from our quest.
We were sent to the underworld to save Nico. He was in trouble with his dad, Hades.
Chiron sent Annabeth, Tyson, and me down there.
We brought Mrs. O' Leary with us to distract Cyberus because they seemed to have fun last time.
It will be faster to get through if Annabeth doesn't have to play with him.
Nico was in trouble because he was trying to get information for camp.
He was asked by Chiron to try to get it, but he recently sent us an Iris message saying that he needed help.
This was a rescue mission, so we had to be fast.
If we were going to be fast we couldn't bring as many people as we needed, so we knew it would be hard.
We knew Hades would be expecting us, so that ruined our only advantage (the element of surprise).
I took only my sword, riptide, the watch Tyson made me, and a bottle of water (so I would always have my strength.
Annabeth brought her hat and dagger. Tyson brought a tree branch. Somehow our mission was a success. Nico's was also.
We got back a week and a half after we left. When we got back a new kid was at camp.
He came with Grover, one of the best satyrs ever. The kid was undetermined, so he was staying in the Hermes cabin.
He had long black hair, tan skin, and was very tall. HE was wearing dark clothes. He looked about 13.
He didn't look like a bad kid, but he didn't look like anybody at camp. He was mysterious, but looked nice.
"Hi I'm Percy Jackson son of Poseidon," I said. "I'm Zack," he said back. "Do you know your parent yet?" I asked. "No," he answered.
"Well it was nice to meet you Zack, but I am really tired so I'm going to go to bed, 'night."
"See you later," he said.