On Tuesday, a former South Dakota special education teacher pleaded guilty Tuesday to repeatedly raping a 15-year-old boy on her farm in 2016.

According to the Argus Leader, Boll, who is married, pleaded guilty to nine counts each of fourth-degree rape and sexual contact with a child under 16, two counts of sexual exploitation and one count of solicitation of a minor.

Boll, a special education teacher at West Central High School, had initially stated that she and the boy waited until he was 16 years old – the age of consent in the state – before starting to have sex, but later revealed their tryst started when he was 15 and at her farm, where they started with kissing before progressing to sex.

Court papers reveal that an investigation started when Boll told a 17-year-old girl she was in a relationship with a 15-year-old student. The girl and her mother collected Instagram posts and text messages showing the teacher-student relationship and alerted authorities.

When a detective interviewed Boll, court papers say the teacher admitted that it started when the boy was working on her farm. She said it started with kissing and led to sex. The boy told police they had sexual intercourse 10 times before his 16th birthday and 10 to 15 times afterward.

Minnehaha County Sheriff's Office Sergeant Jason Gearman said after Boll was arrested in 2016, "Just 'cause you're charged with rape doesn't mean that it's a forced-type situation. In this case, it's a statutory rape where they can't give consent, 'cause of, due to the age."