DISTURBING SECRETS ABOUT ABERFORTH DUMBLEDORE He is good friends with Argus Filch,because they bonded over their love of bestiality.
Sometimes Aberforth would perform charms on Mrs Norris to make her larger, so Filch could fulfil his secret desires with her. He would do the same charms on goats, so he could fulfil his own lustful desires with goats.
DISTURBING SECRETS ABOUT LUCIUS MALFOY He likes to do grave robbery on rich muggles and mudbloods and defile their corpses in the process.
Once he punished Dobby by tying him up and forcing him to sleep in a grave he robbed, until he called him out. Dobby cried all night long :(
DISTURBING SECRETS ABOUT PETUNIA DURSLEY She tried to pay Lily to break up with James after they got engaged. Lily had never been so angry with her before, and told her where she could stick her money.
She would hide Lily's schoolbooks and school stuff to try and sabotage her attempts to do well at Hogwarts,but her parents caught her doing it and punished her.
A DISTURBING SECRET ABOUT QUIRREL/VOLDEMORT He would technically engage in threesomes when Voldemort was still attached to the back of his head.
Voldemort was not sure whether to encourage it, but after the first time, he decided to carry on. He would curse anyone who was bad in bed though.