A 16-year-old boy pleaded guilty Wednesday to rape and robbery of a Lakewood espresso barista and was sentenced to 15 years in prison.

Kyntrel Jackson, 16, pleaded guilty to rape in the first degree, two counts of robbery and theft.

The Pierce County Prosecutor’s Office said Jackson and two other suspects committed a series of armed robberies in Lakewood in 2011.

Last Sept. 29, Jackson walked up to the window of an espresso stand, pointed a gun at the barista and demanded she let him inside, prosecutors said. Once inside, he took cash and demanded she perform oral sex on him.

Jackson was arrested after his grandmother called police and said he had been bragging about robbing a Lakewood coffee stand, prosecutors said.

In a separate case Wednesday, D'Marco Mobley, 20, was convicted in King County Superior Court of rape, kidnapping, robbery, promoting prostitution, promoting sexual abuse of a minor and unlawful possession of a firearm.

Mobley was accused of forcing two underage girls and one young woman into prostitution for his profit. He used threats, fear, intimidation and violence to keep control of the women so that he could profit from them, the King County Prosecutor’s Office said.

A jury deliberated for four days before returning the guilty verdicts. Mobley faces a maximum of life in prison when he is sentenced. A sentencing date was not immediately set.