A Houston have reportedly admitted to drugging a 15-year-old girl and coercing her into having sex, and the woman in the relationship told authorities she recorded the sex on a cell phone in order to blackmail the man.

KHOU-TV reports that the teen was a relative of Isabel Robinson. When the girl asked Robinson if she could borrow money, Robinson said she would pay the girl to have sex with her boyfriend, Judd Thomas Denley.

The victim told investigators she met Robinson at an apartment on March 22, where she was given alcohol and marijuana. Once the victim was intoxicated, Robinson told her Denley was going to have sex with her. The victim reportedly told Robinson she was too intoxicated to walk.

According to an article from Click2Houston, Denley gave the girl a drink that may have been laced with another substance, then sexually assaulted the girl three times. During one instance, Robinson was in the room recording the sex on her cellphone. She later admitted that she planned to use the footage to blackmail Denley, who she alleges threatened to tell her husband of their affair if she didn't allow him to have sex with the teen.

The victim later took the cellphone and gave it to Houston police, who obtained a warrant to search its contents and found two videos of the assault and text messages between Denly and Robinson in which they made plans to meet the victim.

Denly and Robinson have been charged with aggravated sexual assault of a child, trafficking of persons, sexual performance of a child, promotion of child pornography, and compelling prostitution of a minor.