PJO/HP crossover: what will happen?

Pigfarts

Percy's P.O.V
Annabeth and I were taking a stroll by the lake when the Stoll brothers shouted out for us.

"Yo, Percy, annabeth Chiron is calling you two to the Big House. Oh,yeah bring the rest with you."

I understood that by rest he meant the other of The Seven and Calypso,Thalia and Nico.

"Hey Wise Girl you get the girls I'll get the guys"

"Sure Seaweed Brain" she replied. Oh how much I love my Wise Girl.

(At the big house)
"There is a new quest" at these 5 words everyone groaned.

"Aw we just finished a war and now you expect us to go for a quest God knows where?" Leo and Calypso said.

"I wanted some time with Piper\Jason" Jason and Piper said.

"I was going to help reconstruct Camp Jupiter" Frank and Hazel said.

"I wanted to spend some time with my girlfriend" Nico said. We all gasped.

"WHO.ARE.YOU.DATING" we all screamed. Thalia and Nico both looked at each other. No it's not possible Thalia's a hunter. But anyway Thalico is OTP! Shit I sound like Aphrodite, no offence to her.

"I left the Hunters of Artemis" Thalia said.

We were brought back to reality by the noise of someone clearing their throat that we realised that Chiron was over there the whole time.

"It is personally been ordered by Hecate that this quest should take place. She wanted me to send the most responsible people so obviously I choose you demigods."

"Responsible, Seaweed Brain" Thalia snickered.

"QUITE. So as I was saying you all are going to Hogwarts in Scotland"

"Pig fart's. Isn't it dangerous to go to a place where pigs...fart?" Three guesses who said that.

"It's Hogwarts. An old friend of mine said that they just went through war but he has a hunch that three enemies are rising again so you need to protect their hero- Harry Potter and the meantime also make alliances with them. And yes no one I repeat no one should know you all are demigods before fourth semester"

"Wait you said semester are we going to a school" Annabeth said joy and excitement clear in her voice.

"Yes. You all will leave tomorrow at 11:00 am do not be late." And the weird thing was that that everyone was looking at me. "Is there something on my face?" I asked.

"By the way Chiron how will we go? I mean the children of the Big Three and all." Jason asked.

Good question
1) sky- Uncle Z won't be happy
2) water- dad won't want Thalia, Nico and Jason to be in his territory.

"...flash you to London" Chiron said.

"Wait what did you say?" I looked at Chiron.

"Hecate will flash us to London" Thalia said in a pre-primary teachers tone.

(Next day)

"Percy! Wake up or I will zap you" the over violent Thalia screamed.

Everything came back as a flash. Quest, pig fart's,Hecate.

Thank god I slept in my travelling clothes. I quickly ran in the washroom, got ready and went to Thalia's tree. Over there a lady wearing a black cloak Ish thing was standing.

"Lady Hecate" is said bowing and kneeling.

"Okay so do you have any questions for your quest" she said and did not even pay attention to me. Rude.

"Dear lady how did those witches and wizard get their powers?" Annie asked

"Centuries ago I had blessed a group of mortals with power to perform magic with the help of wand. Slowly their population grew and now here they are."