Investigator Mark Dobbins said it was not unusual for Travis Omari McCauley, 32, to be around, which is why the family never suspected anything could be happening.
McCauley, the assistant band director of the CSRA All-Star Band, was charged Wednesday with contributing to the delinquency of a minor, child molestation and reckless conduct by an HIV-infected person.
According to investigators, the victim's parents confronted McCauley after they originally found out that there might have been inappropriate communication going on between him and their son - which McCauley denied.
However, Dobbins said, when the parents again confronted McCauley with more evidence, he admitted to inappropriate contact with the teen.
Family members were concerned, Dobbins said, because they knew McCauley was HIV-positive.
Dobbins said the suspect coerced the victim into engaging in sexual acts four times within the past two months.
Although the victim was a member of the CSRA All-Star Band, initial investigation has revealed that none of the incidents occurred while McCauley was working.
"It evolved because of the relationship the victim had with the defendant, not because of the band," Dobbins said.
The band was started to teach high school-age students how to play on a college level to increase their eligibility for scholarships, Dobbins said. McCauley and another man founded the band in 2005, according to its MySpace page.
Bond has been set at $6,800 for the charge of contributing to the delinquency of a minor. However, all other charges have been made without bond.
Investigators are asking for anyone who might have been exposed to HIV by McCauley to come forward.