Several adult films surfaced on Pornhub featuring a female teacher from California allegedly engaged in sex acts with a teenage female relative, according to reports.

Woodside High School officials contacted police last week about the X-rated videos, which allegedly showed a student sexually involved with 49-year-old Dawn Giannini, an elementary school teacher in Palo Alto, news station KNTV reported.

The victim wasn’t a student of Giannini’s, but they are related, according to the Palo Alto Daily Post. Police didn’t disclose the nature of their familial relationship.

Officials said the investigation was launched after the teen girl was recognized on the porn site by a classmate, who flagged the videos to the principal. The probe resulted in Giannini’s arrest Oct. 18.

Investigators believe the teen victim uploaded the footage to the porn site. The erotic scenes allegedly were filmed starting in 2014 when the victim was 14 years old, the San Francisco Chronicle reported.

“We know that this occurred in at least two counties,” San Mateo County District Attorney Steve Wagstaffe told KNTV. “It occurred here in our county, in Redwood City and there was a trip down to Santa Cruz that she took with the victim and there was sexual activity there.”

Giannini was arrested Oct. 18 on more than two dozen felony charges involving sexual misconduct with a minor.

She is being held in jail on $1.75 million bail and is set to appear in court next on Nov. 5.

The Redwood City School District fired Giannini from a substitute teaching position in light of the arrest, the Palo Alto Daily Post reported.