Boys' Love Novels Thorn Cage Takeshobo Lovers Library GREED

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Hakuto Shinoda, a freeter, is called by his older brother, Riichi, a police officer, and goes to the room of Kuga, Riichi's lover and his subordinate at work.
Then, the three of us share a bed under Riichi's orders.
Hakuto had a reason why he couldn't go against Riichi.
Kuga, who met for the first time, brutally trampled Hakuto with anger and contempt.
"I will make you fall. Get dirty until it turns black."
After that day, Kuga began to hold Hakuto forcibly when Riichi was absent?
What is the fate of Hakuto, who is trapped by his black love?