Cheater female Harry Potter x male Slytherin reader x female Draco Malfoy LEMON

The male reader is Draconia's childhood friend and Harrina's boyfriend even though she's a Gryffindor and he's a Slytherin. Everything was fine until the male reader found Harrina cheating on him with his rival Cedric diggory. P.s. Harrina's and Draconia's age will be 18.