A Miami charter school teacher is facing charges after police say she had a sexual relationship with a 17-year-old boy for nearly two years.

Valeria Ashley Costadoni, 30, an English teacher at Miami Arts Charter School, was arrested early Monday on charges including lewd and lascivious battery on a child 12-16 years old.

According to an arrest report, Costadoni and the teen have been engaging in consensual sex for about two years. The teen said he had sex with Costadoni at her home about four times, and on many occasions she would perform sex acts on him in a classroom while everyone was gone, the report said.

The two also had sex in her car and at the teen's home, the report said.

Costadoni appeared in court Monday where she was ordered held on $15,000 bond. She was also appointed a public defender.

According to the school's website, Costadoni is the language arts department chair at the school's Wynwood campus. She was born in Paraguay and moved to Miami in the early 1990s, where she was an honor graduate of Miami Coral Park Senior High School, the website said.

Costadoni earned a degree in poetry from Johns Hopkins University in Baltimore and is in her seventh year at Miami Arts Charter School.