DarkMagic3498

i'm trying to find this book i read a while back i can't remember the character names or the title all i remember was that this girl and her little brother were split apart the girl was being sold at a slave auction and she was bought was thrown in the back of a van or car with a bag over her head and when she woke up she walked out into a hall and when she walked passed a room she saw two monster creatures a male and female and  the male was all up on the female and like the guy monster/demon chased the girl through the manchine  and  she ran into a ball room filled with monsters and demons she was stopped by a man coming out of the crowd who looked human, but it was the demon lord and he dragged her to a study by her hair but before he dragged her she saw her little brother and alot more people/ teens and kids they were getting eaten by the monsters and she tried to get her brother but he was attacked the demon lord left her in the study and went back for her brother but it was to late.. and like there was a succubus involved and she wanted the lords slave and  there was an incubus that was the lords friend and later on the succubus girl gave the slave girl a necklace that would take her back ome if she worked with the succubus for a while and  the demon lord got super pissed and later on they go to a ball party at the demon lords fathers house and i cant remember his name and one of the other lords were there with his slave and the two slaves became friends but it was a trap and the other lord and slave took the main lords girl and tried to kill her till the inccubus and the demon lord came to save her and she was hurt and wasnt going to make it and the demon lord felt like shit and started to fall in love with her.. DOES ANYONE KNOW WHAT STORY IT IS ITS LIKE THE DEMONS ANGEL OR SMOETHING IDK BUT IF YOU KNOW PLEASE TELLL MEEEEE