An Oklahoma teacher is accused of having sex with a high school student after the boy’s parents reported nude photographs and text messages on their son’s phone to authorities.

Hunter Day, a 22-year-old teacher at Yukon High School in Yukon, Oklahoma, was arrested Wednesday after authorities said they used the boy’s phone to confirm a meeting and found Day sitting on her living room floor with the lights off and candles lit.

Day, who officers say admitted to having a sexual relationship with the boy, is charged with rape in the second degree, possession of child pornography and soliciting sex from a minor using technology, Canadian County Sheriff’s Office officials said in a statement posted on Facebook. Day is being held on $85,000 bail.

“This is a classic case of a serious breach of public trust,” Canadian County Sheriff Chris West said in the statement. “School teachers are entrusted to protect and educate our children, not to engage in an unlawful sexual relationship with them.”

Authorities said they were made aware of the alleged relationship after receiving a complaint from the boy’s parents, who were worried that their son had already had sex with the teacher. It is unclear whether Day, who taught science, actually taught the student.

The parents asked investigators to conduct a forensic review of their son’s phone, officials said.

Investigators say they discovered evidence that Day and the boy already had sex and had made plans to have sex again at her home Wednesday.