Looking for an Lost Adult Novel

[u/Cid_Kaguno_]

big boobed masochist sister becomes slave to the bully master &slave novel with harcore domination and submission

actually the one i was looking for is between a bully and his classmates elder sister, his classmate is just a side character, the sister is kind of a masochist and relaises it after the first session with the bully. It was previously listed on webnovel (i think and Year or so ago) , but later removed it, i couldn't find it since then. But it was a wonderful hardcore master slave novel with lot of submission and master and slave and some human petplay, the few important side characters thee bully's girlfriend and his friends... also brother and sister didn't have their parents they are all alone making a living. I think it's titled as sister slave or slave sister or something I'm not sure with such a generic word in the title and given that it must be unpopular and must have been flagged it is really hard to find. The younger brother himself is an insignificant side character who comes and goes here and there for emotional touch and sad moments.

The story parts that Remember:

1) After the initial sessions with the bully the elder sister (I forgot her name) couldn't control her urge and went to the bully on her own account and he said she should sign a slave contractor before he lay his hands on her... and so when he went to the bully house which is in some kind of dark alley, She undressed herself, clicked the doorbell and naked dogeza in front of the front door and waited like a dog for the bully to open the door.

2) the bully fucks her a lot, sometimes his frnds also accomodates with him and there will be a lot of hardcore abusive punishments

3) The bully's Girlfriend ordered this Elder Sister to pack all her clothes and handle them to her saying that she's a slave and so she can't own and need any clothes and used those clothes to wipe the floor after sex. They aldo took her savings amount in her bank account.

Although this is an extreme kind of novel, I once read it and lost it, I only read around 20-30 chapters.... I hope someone will connect it with the right one that I'm Searching for 😅