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Gulson, a former Knox Grammar School teacher, began chatting in August 2024 with a profile run by two teenagers on the LGBTQ+ dating app Grindr, the court heard.

The girl, aged 15, was posing as a Year 9 boy “looking for older men”.

Despite being told the user was 15, Gulson allegedly carried on with a sexualised conversation for more than 40 minutes.

“Do you find it hot that you’re as old as some of my students?” he asked, before adding he felt conflicted.

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After receiving a photo, Gulson replied: “Such a cute boy.”

The court was told he encouraged the teen to sneak out of his parents’ house so they could meet and find a “quiet place” for sexual activity.

He also allegedly described in graphic detail the sex acts he wanted to perform, 9News reported.

In court, Gulson denied believing he was speaking to a child, claiming he thought the account belonged to a “wacko adult” pretending to be young.

A private school drama teacher clutched the hand of his strongest supporter - his gemstone heiress mother - as he walked into court to be convicted of a paedophilia charge.

William Roberto Gulson, 28, a now former staff member at $45,000-a-year Knox Grammar on Sydney's north shore, was found guilty of one count of procuring a child under 16 for sex this past week.

Grindr messages tendered in court showed Gulson telling a person who he believed was a 15-year-old boy that he could 'come to your house' and find a 'quiet place' for sex.

But the teenager he thought he was grooming was actually an unnamed young woman determined to 'catch pedos'. Her effort has culminated in Gulson being put before the courts and facing a maximum sentence of 12 years' imprisonment.

A prison cell is a far cry from how ballet dancer Gulson was raised - or indeed, how he has spent recent years. The Daily Mail can reveal he holidayed overseas to the south of France with his mother, socialite and gemstone heiress Sally Sherman Gulson, while he was on bail.