The devil is mad for you (male y/n)

The devil, satan , is a new Highschool student under the name Lucifer 'Luci'
And y/n falls in love as much as he is with you. You know he's a the devil after a near death experience in school.

Kat (female)
She is your best friend and supporter since childhood, her real name is Kado but as stated you call her Kat. She knows of your home life and keeps all your secrets. Her hair is a blonde-ish white hair and he wasn't a short girl but she was definitely not the tallest either. She has a kind personality and loves to have a bit of banter. Her and Satan don't really reflect each other due to him not getting sarcasm or any humor that isn't dark.

Lucifer (male)
He was the new kid in school that you and Kat had to Tour him for the first two weeks, however he isn't whom he says. His true name is Satan he doesn't have a true last name so he uses the Christian description last name 'MorningStar'.
He needs human blood every now and then to get by. He's not the biggest fan of casual foods, his humor is mainly consistent of dark humor or mythology. He realizes that he had what he calls a weakness, if you get hurt he wants war upon that person. Kat's sarcasm grows on him after a while and he is a very truthful person as well as unhinged.