Months after

"Mom!" I yelled, bursting through my front door. I had left Annabeth in the car so she wouldn't have to move as much. My mom was cooking some Ramen Noodles in a pan, and I had apparently scared her so bad, she knocked the pan over.
"Percy! What the hell? I just-"
"Annabeth!" I said, panting. "Shes... Shes..." I was so out of breath I couldn't speak. So, I motioned to my stomach, and made it look like I was giving birth. My mom didn't understand.
"Percy, whats..." She understood
"Go! Get back to her! Let's go!" She grabbed her purse off of the counter and rushed out the door, while I half-jogged out to the car.
Annabeth was sprawled in the back, sweating like she ran a marathon. She was screaming in pain, and it hurt me so much to see her like this. Other times, like a monster attack, I could provide some kind of aid. But know, I couldn't do anything about it.
"Move," My mom said. "I'll drive." I scooted over to the passenger seat, and reached back, grabbing Annabeth's hand.
She pretty much broke my fingers.
"Do you even know if it's a boy or a girl?" My mom asked.
"No," I said hastily. She sighed. "Looks like we're gonna find out."
I brought out my phone, and texted or called as many people as I could, including Jason, Piper, Leo, Frank, Hazel, and Bella.
I didn't give anyone a chance to reply. I hung up as I told them to meet us at the hospital, a few blocks down the road.

"Push! Push!" The doctor's voice rang through the door. I was sitting in a chair outside the room, with the rest of the gang (Except Hazel and Jason; they were at Camp Jupiter and had no time to come, but they said they'd try to get there when they can).
It was excruciatingly painful to hear Annabeth cry like this.

"Frank? What's going on?" A girl asked, walking down the hallway. She had jet black hair and green eyes, and around the same age as me. She was a few inches shorter than me, but still... She looked like a female version of me with glasses. She was walking with Hazel behind her.
"Oh, hey... Jessica..." Frank said, standing up.
"I heard about someone giving berth, but you didn't specify..." She looked over at me, and our eyes met.
"Are... Are you... Percy?" She asked, fixing her glasses.
I took a second to respond.
"Yeah... Yeah, that's me." I stood up, and Frank did the same.
Frank stood next to her.
"Percy, this is Jessica. Jessica, this guy here, his... erm... girlfriend is giving birth."

Frank paused for a moment. "Percy, Jessica's your sister."

Notes