Backstory: Y/N was cornered in knockback by Bellatrix and other death eaters, they poisoned her mind and lowered her self-esteem to minus. They told her that Mattheo (Y/N dating Mattheo) didn't actually love her, that Hermione hated her but was fake kind because Harry was using her homework and such. She gave in and started thinking and then believing that it was true. She would lay in bed and never sleep, continue to think about until, one night she used a forbidden spellbook and let bad sports into her, letting them guide her thoughts. Then we come up to here
