As far as i can tell this is made up of two novels the first is a Harry Potter & Supernatural crossover. I’ve not started reading the second yet so I’m not sure it’s still Harry Potter but ive not seen where it crosses Yet.
Second novel is purely a harem novel with slight slash as malfloy is part of said harem. he’s gay and uses a genderbending potion to change into a girl to join Harry’s harem.