Boys aged 14 to 16 were attending a sleepover at Lynne Long's Pennsylvania home when Angela Honeycutt, the mother of two children, allegedly had sex with a 14-year-old boy and performed sex acts on a 15-year-old, local TV station CBS3 reports.
Police said Long, 45, watched and listened while Honeycutt, 38, sexually assaulted the boys.
The mother of two reportedly also showed her breasts, "open-mouth kissed" some of the boys, engaged in a sexual conversation and entered the shower with a minor.
Long told the teenagers "not to say anything", according to police.
Police chief Ken Coluzzi said this "particularly outrageous" incident was a violation of trust.
"You think you've seen everything and then all of a sudden another report of an outrageous crime comes in," CBS3 quoted him as saying.
Police learned of the assault after one of the boys from the party told his parents of the events.
Neighbours reacted in shock as news of the arrests spread through the suburban community.
Honeycutt has been charged with statutory sexual assault, unlawful contact with a minor and other related charges, while Long faces charges on the corruption of minors and endangering the welfare of children.
Both women have been released on bail.
The only thing "outrageous" about the stupid reaction people have to this. I'm somewhat jealous, myself. As if you'd tell your parents!
