A children’s magistrate who sentenced a former private schoolboy over the rape of a 15-year-old girl at an eastern suburbs party has urged the teen to not let the crime “hold you back”.

The boy, who was 15 at the time of the sexual assault, has been sentenced to 20 months’ probation over the 2017 incident, which was filmed by a friend and widely distributed.

The boy pleaded guilty earlier this year to aggravated sexual assault and to disseminating child abuse material.

He was also sentenced to 18 months’ probation for distributing the disturbing video, an order that will be served at the same time as the larger probation period.

After delivering her sentence, magistrate Sue Duncombe told the boy that the sexual assault would not determine his future.