An English teacher at a Dallas high school is accused of inappropriate contact with a student after the boy’s mother reportedly caught her with her son in a swimming pool at the apartment complex where they live, according to CBS Dallas.

Lesley Ann Sharp faces charges of improper relationship between educator and student, possession or promotion of child pornography, tampering with physical evidence and perjury, according to the Dallas Morning News. The 24-year-old teacher is accused of accused of having sex with the 17-year-old more than 25 times, in locations such as her car, her apartment and even “in his apartment while the student’s parents were not home.”

The child pornography charges stem from explicit photos that Sharp allegedly exchanged with the boy via text message, according to police. Police allege that Sharp and the student, a freshman at Hillcrest High School, “exchanged 116 telephone calls, 173 multi-media messages and 15,371 text messages” between May and July of this year.