A teenage boy says he told his social worker he was in love with her, three days after meeting her, and two months before she took him to a hotel room and had sex with him.
Alexia Joseph denies a charge of unlawful sexual connection with an underage boy.
The jury at Manukau District Court has been shown a police interview from 2013, when the boy was 15, and Ms Joseph was 28.
He described how he was introduced to Ms Joseph in May that year, but their communication stopped after three days, when he told her he loved her.
But he said she would then call his mother to get through to him, before they met up again in June.
He said it was a month or so later that she took him to a Mangere motel room and had sex with him.
The boy said he and Ms Joseph went to the cinema that afternoon, where she touched him, including on his stomach, hair, ears and chin.
He described how his mother and Ms Joseph went out for a meal in Mangere, where the two women become quite drunk.
The boy said his social worker repeatedly asked him for sex after she'd spent four hours drinking alcohol with his mother.
He said that night she took him to a motel where she asked him to pull her hair, and where they had sex.
The boy said they drove back home but his mother said he could stay with his social worker. He said Ms Joseph then took him to a motel room, where she repeatedly said she wanted to have sex, and asked him to pull her hair.
Ms Joseph's defence said no sex took place, and her lawyer has suggested to the teenager that he made up the allegations.
While cross-examining the boy, Ms Joseph's lawyer Paul Pati put it to him that he had made up the sex, and the touching in the cinema.
He said his client fell asleep on a single bed in the motel, and no sex took place.
The trial continues.