3rd person POV
Annabeth leaned in to kiss Percy they were celebrating his 18th birthday then they were interrupted.
"I don't think so." A strange and beautiful lady said.
Annabeth got suddenly afraid for she knew who this was.
Flash Back
Annabeth I don't want you falling for that sea spawn." Athena said
"But mom I love him!" Annabeth said in tears.
"Annabeth you must swear on the River Styx that you will not date him, or I will kill him" Athena said
The words drilled into her soul but she cared too much for Percy to let him die so she swore on the River Styx that she would not date him.
End of flashback
"Who are you?" Percy asked obviously checking out the beautiful women in front of him.
"My name is Styx" River Styx said "I am here to end this relationship Annabeth promised to her mother on my name to not date you Percy and when someone doesn't follow through on a Promise made with my name it makes me look bad." She finished
"I guess not many people break their promises on your name." Percy said eating the eye candy in front of him.
Annabeth couldn't say anything so she ran out the door leaving Percy her ex-boyfriend and Styx alone.
"Excuse me I got to go." Percy said following Annabeth.
Annabeth refused to say anything to Percy but "it's not your fault its mine" and a few other things so Percy went back to his cabin only to find Aphrodite in there.
"Aphrodite?" he said
"Annabeth wasn't able to give you your present so I will." She said using charm speak.
Percy knew she was using charm speak he decided to give into it and then he was under her control.
"It's a shame about you and Annabeth" She said seductively. Kissing him and he kissed back then they fell on the bed and had a magical night.
Percy's POV
I woke up in the morning and got up to find myself naked and a girl in my bed then I remembered what I did last night. I didn't feel guilty Annabeth and I were broken up she told me to find someone else. I saw the condoms on the ground and threw them away. Then I put some clothes on and told Aphrodite to wake up.
"That was nice last night Percy" She said seductively
"We're not doing that again Aphrodite, I know you're a one or two time deal" I said
"All right suit yourself" She said flashing out.
I did my daily activities, ate breakfast lunch and dinner, went swimming, had sword practice, hung out with Nico, and texted with Thalia with new Demigod phones. Then after my nighttime swim with blackjack (blackjack has become fond of swimming with me) I went to my cabin to find Styx in there.
"Can I help you?" I said
"Percy normally I don't make people keep their promises under my name if they were forced and I didn't want to with Annabeth but you and I have a strong connection." She said
"How?" I asked honestly
"You bathed in me and when a Hero baths in me male or female I have a child and when the hero that gave me the child falls, the child does as well and only one of my children is left." She said
"Who is the father?" I asked knowing the answer.
"You" She said "My children are a copy of the demigod who made them possible accept they are the opposite gender but I must let her go."
The next day
I woke up to Chiron and a little girl she looked around 2 years old and she had Raven hair and Sea green eyes.
"Percy this is your sister" Chiron said "Or so thought she hasn't been claimed yet but we tend to know a child of Poseidon when we see one."
"I've always been kind of lonely ever since Tyson left I'm sure she will keep me company what's her name?" I said
"We don't know" Chiron said
"Mommy said Daddy gets to name me" my sister said.
"Who's your mommy?" Chiron asked
Just on Que a black river formed over here head with a trident in it.
"What has the Styx and Poseidon had a child! That means this little one is a goddess!" Chiron said baffled
"No she's mine" I said explaining to Chiron my meeting with Styx
After that I decided to take her to the one place I knew she would be safe: Thalia more specifically the Hunt. We took blackjack and I landed in the middle of their camp and I forgot to text Thalia ahead of time so she along with the hunt was surprised.
"Percy what are you doing here?" Thalia asked
"I got a new recruit for Artemis" I said
"Percy would that happen to be your sister?" Thalia asked
I ignored her question "Were is Artemis" I asked again
"Percy answer my question" Thalia persisted
"Shut up and bring him to Artemis" Phoebe said "I just want him out of here"
"He would kill you easily Phoebe" My daughter said
We all looked stunned because we were
"How do you know her name and that I could kill her?" I asked
"I don't know how I know I just do." She said
"I think I'll bring you to Artemis" Thalia said
"No need I'm here" Artemis said "Now what's all the commotion about?"
"Artemis I have a new recruit for you" I said
"Her" I said putting my daughter forward
"No" Artemis said without a second thought
"Is it her age?" I asked
"Milady we can work with age she will be a great addition" Thalia said
"I won't take Styx spawn" Artemis said
"Percy is that really you?" Thalia asked
"In away yes" I said
"What are you calling her?" Thalia said
"Her name is Zoe and don't argue Perseus or she will die you have disgraced me by offering me a Styx spawn" Artemis said
"Alright my name is now Zoe" Zoe said