According to the indictment, Dallas Colby Cardenas forced both teens to pose for photos used in Craigslist ads and then forced them both to have sex with men who responded to the ads. He told the teen to charge $175 per hour or $150 per half-hour and then turn over most of the money they earned for the "tricks" to him, the indictment said.

Cardenas also made the 17-year-old have sex with him to groom her for prostitution, according to the grand jury indictment. (Read the full indictment. )

Some of the acts of prostitution occurred in motels in Denver and Lakewood, and some of them took place at Cardenas' apartment, according to the indictment.

Ryan Keith Jenkins is accused of driving the teens to the "out-calls" at the motels. The prostitution occurred from May 18 to June 4, according to the indictment.

Cardenas, 19, has been charged with human trafficking, pimping, trafficking in children, pimping of a child, pandering of a child and inducement of child prostitution.

Jenkins, 23, has been charged with conspiracy to commit pimping and possession of a controlled substance. Investigators found Ecstasy during a search of Jenkins' Denver apartment, the attorney general's office said.

Cardenas has been arrested, but Jenkins is not yet in custody, said Mike Saccone, with the Colorado Attorney General's Office.