When interviewed for the pre-sentence report, Moke said he was "responding to the victim's needs'' and the victim encouraged his behaviour, she said.
Ms Gordon said Moke showed no remorse and no comprehension of the nature and extent of what he had done.
Moke's lawyer, Harry Edward, admitted there were no mitigating factors apart from his client's guilty plea.
Judge Chris McGuire said the victim had described feeling like she was "basically his sex slave''.
"It became normalised for her. This was her life. This was what her days and weeks consisted of,'' he said.
He said the victim had not written a victim impact statement and noted it was often not until later in life victims of this type of offending succumbed to the psychological damage.
Judge McGuire said he imposed the minimum eight-year prison period because an ordinary parole period would not have been sufficient to meet the need for denunciation and deterrence.