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FORT WORTH (CBSDFW.COM) – A Fort Worth teacher was accused of an improper relationship with a student and taking him out-of-state without telling his parents.

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Police said a father came forward with the accusation after looking at his son’s Facebook page and discovering inappropriate messages between the teen and his teacher Alina Leung, 29.

Leung is a teacher of 6th and 7th graders at P. L. Dunbar Young Men’s Leadership Academy.

Police said Leung told the boy she wanted to wait until 2017, when he turned 17, to have sex with him because it would be legal then.

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But after an investigation the student told police the relationship started in October of last year, that included photos, sex in the teacher’s car and even a trip to Oklahoma for two nights without his parents knowing. She even cheated on her boyfriend with the teenager, according to the police affidavit.

Leung faces charges of sexual assault of a child, unlawful restraint for taking him across state lines and improper relationship between a teacher and student.

She is on administrative leave.

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