Rory Amon, 36, returned to the witness box on Monday to defend a slew of child sex charges relating to various acts done to the teen in 2017.
The boy, who was 13 years old at the time, met the future politician through a gay dating app before the alleged rape and sexual abuse took place.
Amon says he drove to the teen's Sydney apartment on July 22, 2017, believing the youth was 17 years old.
On Monday, he told a NSW Supreme Court jury he had met the boy outside the unit complex before being led to the underground car park's bathroom.
He was hazy on the details about what happened next but said he likely would have asked the boy for a kiss.
"My usual approach would be to ask someone if I could kiss them before I kissed them," he said.
His barrister, Matthew Johnston SC, repeated evidence that the now 22-year-old complainant gave earlier in the trial about what happened between the pair.
The man said Amon had guided his hand to his genitals before they went on to have oral sex.
"I don't dispute that," the former MP said on Monday.
However, Amon denied allegations that he visited the teen's home a second time where the then-boy says further sexual acts took place.
On this occasion, Amon allegedly brought a towel which he placed on the floor of the bathroom.
The jury was taken through bank statements, text messages and toll records from the weekend of July 22, 2017, as the jury was shown Amon's busy schedule.
On the day he admitted meeting the teen, the former MP said he earlier refereed two rugby matches in Canberra.
At the time of contacting the youth, Amon was working full-time for the federal MP for Mackellar, Jason Falinski.
He would go on to serve two terms on the Northern Beaches Council before being elected as the Liberal MP for the state seat of Pittwater in 2023.
In 2022, he reconnected with the alleged victim on Grindr, sending him a number of messages including a photograph of himself wearing volunteer firefighter attire.
The former MP has pleaded not guilty to 10 charges including five counts of having sexual intercourse with a child and two counts of attempted sexual intercourse with a child.
He also denies indecent assault charges.
The trial continues.
1800 RESPECT (1800 737 732)
National Sexual Abuse and Redress Support Service 1800 211 028
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