Cardno's trial had begun in the district court on Monday.
Summing up for the jury before they retired, Judge Arthur Tompkins said the Crown's case was that the complainants' evidence was truthful and sufficient and they had no reason to lie.
The Crown said the complainants had not "put their heads together, colluded and made false allegations", Judge Tompkins said.
The defence case was that nothing sexual had ever happened and the complainants had invented the story because of problems they were having in their lives at the time the alleged offences took place, the judge said.
The defence also challenged the reliability of the complainants' evidence.
Cardno, who gave evidence during the week, denied all the allegations and told the court he was in a relationship when the alleged offences took place.
He was remanded on bail until sentencing on November 26.
APNZ