MINE or maybe OURS! (Kokushibo x m! reader x Muzan)

8 year old y/n had been blinded, by no one else but his father. Years had gone by as he had been a servant in his own very household. One night, whilst going to his usual spot to feel the night breeze. An unexpected visitor sat there.
What would happen as this new chapter in y/n's life has been opened.
--------------------------------------------------------------------------------------------------------------------------------------- There may be gore, violence and maybe some mature themes. Read at your own risk. There is a chance, not a large chance but a small chance that this series may be discontinued. I'll try my best not to discontinue this but I hope I'll have your support. I don't own any of the characters other than y/n.