Court documents say Terry Bowser, 38, and Victoria Poling, 26, were arrested Friday and placed in the Mercer County jail after failing to post $250,000 bail each.
The older victim in the case said she was forced into taking showers with one or both of the accused, had to watch pornography with the pair and also perform sex acts, police said.
The younger victim said she too was forced to take showers and perform sex acts under the threat of them abusing an even younger child, police said.
Charges against Bowser and Poling include rape forcible compulsion, involuntary deviate sexual intercourse with a child and indecent assault with a person younger than age 13.