I actually never finished reading this arc and it popped into my head today. I believe the oriHost was a sub-beastman(?) who lived with his abusive biofather and white lotus stepmother/step-brother. The step-brother is the original protagonist (?) and would have married the original ML, a high military ranking beastman who worked for ML (the marshal). MC turned the tables and called the sub-beastman protection association who had him adopted by the Marshal. I think there was also something to do with gem betting in this arc? Thank you so much for your help
I searched google and maybe it's "Who Touched My Tail!" arc 13? Haven't read it so I'm not too sure...