(Portland, OR)  --  An Oregon man is facing charges in connection to a human trafficking case involving a juvenile girl.  The Washington County Sheriff's Office has arrested 21-year-old Devanne Branderhorst of Sandy on charges of prostitution and sexual abuse following a months-long investigation.  Police say he knew his victim was 17-years-old when he coordinated meetings with men who paid for sexual acts.  He's also accused of sexually assaulting the girl.  Bail is set at 750-thousand dollars.  Police say they've also arrested 74-year-old Robert Sunamoto of Portland on sexual solicitation charges after he allegedly met with the girl.