Kimberley Cramp, 28, who also has an intellectual disability and cerebral palsy, is facing time in jail after pleading guilty to the rape and false imprisonment of the women, and theft of $13,000 of their money, between August and October 2016.

Her partner Alexander Trewin also pleaded guilty to false imprisonment and theft.

The victims, now aged 27 and 24, thought they were travelling from their Warnambool home to Frankston, but their friends Cramp and Trewin bought train tickets to Wodonga instead.

Crown prosecutor Peter Triandos told Wodonga County Court this week that Cramp had been shown how to apply cream to one of the victim's genital area for treatment.

But two days after she arrived in Wodonga, Cramp applied the cream then proceeded to digitally rape the woman, saying "I'm helping you and I'm not going to stop".

"Cramp said 'don't tell anyone what I've done'," Mr Triandos said.

The second victim was raped in the same way and, in a victim impact statement read to the court, said she was still upset by the sexual assault and "petrified" Cramp and Trewin would come and get her again.

"I still have nightmares about what happened, including Kim touching my private parts and Alex jumping on top of me," she said.

"I feel guilty, like I've done something wrong."

The women were allowed to leave the house for things like shopping, but were told to reside at the Wodonga home - and they did not have the capability to leave.

Cramp and Trewin took control of their mobile phones and ATM cards, and Cramp held up a sign saying "we're fine", instructing the victims what to say during a phone conversation.

They stole $4000 from one victim and $9000 from the other, including a $1000 Centrelink advance.

The money was used to buy a dryer, suitcase and other household items.

One of the victims said she had been left traumatised by the rape and false imprisonment, and had been made to believe her family no longer wanted her.

"I don't leave the house, I don't like loud noises and I don't like giving people hugs because it's too close," she said in her victim impact statement.

Cramp and Trewin were eventually arrested in January 2017 when the victims told family what had occurred.

Loneliness and a desire for friends were the motivation for Kimberley Cramp and Alexander Trewin's decision to imprison two women at their home.

Cramp's barrister Martin Kozlowski said applying the cream to the victim's genitals was a "medical hygiene procedure in good faith", but in admitting the rape "we are conceding on these occasions, she went too far".

"She struggles with understanding the effect her actions have on other people, and other people's emotions," he said of Cramp's disabilities.

Judge Richard Smith said she had taken advantage after being asked to do something proper.

"She might need some cream to be applied, but I don't see how that could possibly be confused with masturbation," he said.

"That's quite different than taking significant advantage of the person by stealing their money and credit card."

Crown prosecutor Peter Triandos argued a community correction order would be a suitable punishment for Trewin, but Cramp should receive a jail sentence with parole, which would mean a maximum term of at least 12 months.

The case was adjourned for sentencing in April.

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