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Mark Steven West, 30, an assistant principal at Spring High School, was arrested and charged with having an inappropriate relationship with a student.
Mark West, 30, had sex with the high school student in his office after she said 'she was horny': police

A Texas assistant principal had sex with an underage female student in his office during her high school prom, police said.

Mark West, 30, is accused of having sex with the Spring High School teen - who is now at college - after she told him "she was horny" at the event last May.

West denies the charge of having improper sexual relations, but has resigned over the allegations.

ABC reports that a student witness contacted cops after seeing West, who is said to have initially turned down the girl's flirtatious advances, telling her to meet him in his office.

The witness then reported seeing the pair having sex.

West, who was arrested on Monday and released on a $30,000 bond, will appear in court next month.

ABC also reports it is not the first time he has been investigated, with principal Donna Ulrich saying reports had previously been made about his alleged conduct.

He was accused of making a sexual comment to a female student and engaging in a possible sex act with a former student. But charges were never filed due to a lack of evidence.