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Two western Pennsylvania women are criminally charged after allegedly inviting a 15-year-old boy over for pizza and then engaging in a three-way sex act with him.

UPDATE: This article has been updated with new details from the criminal complaints filed against both Weaver and Simms.

Two Westmoreland County women have been criminally charged after authorities say they engaged in a three-way sex act with a 15-year-old boy they had invited over for pizza.

The charges against Melissa E. Weaver, 26, and Tonia M. Simms, 37, both of Latrobe, were announced by WTAE-TV on Thursday.

They include as yet ungraded counts of statutory sex assault, corruption of a minor and indecent assault of a person under the age of 16. Plea hearings are scheduled for both women on Nov. 16 in Westmoreland County Court.

A criminal complaint filed by Greensburg State Police includes the following account of the incident, which is said to have occurred at Simms' Armstrong Drive apartment between July 8 and July 18:

* The victim says he met both Simms and Weaver through a friend who lives in the same apartment complex as the women.

* Victim said he was visiting Weaver on the night in question. He said at some point in the evening, both Weaver and he were invited over to Simms' apartment to eat pizza and drink alcohol.

* Victim said after eating, Simms went upstairs to put her children to bed. He claims Simms came back downstairs a short time later and invited both Weaver and he up to her bedroom.

* Inside Simms' bedroom, the victim said Simms and Weaver began to kiss while he watched. At that point, the victim said, Weaver looked at him and asked, "What, you never had a threesome before?"

* Victim said he went on to have sexual intercourse with both women in Simms' bedroom.

* According to the victim, both Simms and Weaver knew he was underage. Investigators point to a text message exchange between Simms and the victim's friend, the one who also lives in her apartment complex. In it, authorities allege Simms told the friend to say the male victim was 21 years of age "if anyone asked."

* Victim said he'd had sex with Simms on other occasions as well, but couldn't remember the dates.

* When confronted with the boy's allegations by police, Simms allegedly confessed to engaging in sexual activity with the underage victim, explaining "It was a big mistake" and that "she shouldn't have done it."

* Police say Simms also admitted to a sexual encounter involving her, Weaver and the child, and that she said "it started out as innocent flirting and turned into a big mistake because they all had a moment of weakness."

* When Melissa Weaver spoke with police, she allegedly told them that while she was too drunk to remember having sex with the victim, she does remember the boy having sexual contact with Simms.

It was not immediately clear how police became aware of the allegations against both women. A message left for an information officer with the Greensburg State Police was not immediately returned on Thursday.

Messages left with attorneys for Weaver and Simms were also not immediately answered.

Meanwhile, both Simms and Weaver were in a Westmoreland County magisterial district court on Wednesday, where they waived preliminary hearings on the charges against them.

Simms is charged with 5 counts of statutory sexual assault, one count of indecent sexual intercourse with a person less than 16 years of age, one count of corruption of a minor and 5 counts of indecent assault of a person under the age of 16.

Weaver is charged with one count each of statutory sexual assault, indecent sexual intercourse, corruption of a minor and indecent assault of a minor.

Weaver is currently free on $10,000 unsecured bail, while Simms remains confined to Westmoreland County Prison, unable to post the $20,000 cash bail set in her case, online court records show.

A quick online search shows no prior criminal history for either woman in Pennsylvania.