Percy Jackson Teaches at Hogwarts (Percy Jackson and Harry Potter crossover)

A strange offer

Percy POV

I was starting to enjoy my immortal life with my girlfriend, actually, wife. As you know, I already turned it down. But fates had other ideas.

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As soon as the war was over, the Seven, Will, Nico, Reyna, and Calypso were summoned to Olympus.
"Perseus Jackson," Zeus boomed, "we have summoned you here to give you immortality."
I was about to argue when Zeus kept going, "We know you will say no, but the fates have decreed that this will be so. However, all demigods in this room will also be granted immortality." (Calypso lost her immortality when she left her island )
I was kind of excited, I got to live with my Wise Girl forever!
We all accepted the gift.
It went a little something like this,

Percy: Tropical Storms and PTSD (Tartarus)
Annabeth: Architecture
Jason: Air Travel
Piper: Inner beauty
Frank: Animals
Hazel: Gems
Leo: Flame
Will: Medicine
Nico: Shadow Travel
Reyna: Strength in battle
Calypso: Gardening

Me and everyone else will forever be 18. We all got our own places, and we all teleported to them.

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It was a few years laters, and I was sitting with Annabeth on the couch talking about our immortal future, when Hecate teleported in.
"Percy, I need you to be a teacher."
Me and Annabeth started cracking up.
"Wouldn't Annabeth be better?" I asked. 
Hecate looked annoyed, but continued, "The students there just got out of their own war. They need help."
I understood why she asked me. "What about his powers?" Annabeth asked.
"This is a school of wizards and witches, so you should be slightly cautious, but you shouldn't worry. I'll be coming to pick you up tomorrow."
With that she left.
I wasn't too suprised about the wizards, I had heard Hecate talking about them during the Solstice. I didn't want to leave Annabeth, but I knew that these kids needed my help.
"I'll get your stuff ready." She said leaving the room. I smiled. She still knew how much of a Seaweed Brain I am.
I went off to get ready.

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The next day, I was waiting for Hecate. When she did, it was all business.
"I will now bless you so you will be able to preform spells. We are teleporting to the school in question and you will be on your own, except for Iris Messages. You will teach Defence Against the Dark Arts, and train your students in physical combat." And we were gone.