Super late response to this but Yuki Ono is one of my favorite models and I've tried to keep up with him. Since you posted he did two videos for Ona Collection this year both his first kinda pseudo-uncensored pieces. He did one video for Achilles Matrix a few years ago as well as some modeling/ad pics for their parent company scouting and escort/massage studio but he never worked for them.
He was/ is an amateur bodybuilder like many of these guys but is otherwise pretty discrete and 100% straight and I think works pretty normal jobs and is now in real estate. I coincidently found his FB last year after accidentally finding his real name in a body-building competition pic/line up after placing in top 5 (Yuki is not his real name it's a stage name but close to his actual one) but he deactivated it shortly after so you can't see it anymore. He has an instagram but he doesn't post many pictures - he's been in a bulking phase and generally gained weight I think due to work/ so I think he's not been wanting to post as many pics or do much erotic work.
I honestly think he could switch to straight amateur nampa if he wanted to. If you want his instagram dm me