According to a Richmond County Sheriff's Office incident report filed Monday, Travis McCauley, 32, who is assistant band director of the CSRA All-Star Band, had sex with the boy three weeks ago.
A second incident occurred a week ago, when McCauley performed a sex act on the boy, the sheriff's office was told.
The boy became concerned after learning that McCauley was HIV-positive.
After McCauley was confronted through a text message sent by the victim's mother, he admitted to the acts, according to an incident report.
An updated report says McCauley was arrested Wednesday on charges of contributing to the delinquency of a minor, aggravated child molestation and reckless conduct by an HIV-infected person. Bond was set at $6,800 on the contributing to the delinquency charge, but the jail Web site lists no bond on the other charges.
Editors's note: Factual errors in an earlier version of this story have been corrected. An updated story containing police interviews has been posted on-line.