A schoolgirl who tricked another teenage girl into a sexual relationship by making her believe she was a boy has been released from prison after judges decided her sentence was too harsh.

Justine McNally, now 18, pretended she was a Goth boy called Scott and even promised her 16-year-old victim they would get married and have children.

She admitted sexual assault and was sentenced to three years at Wood Green Crown Court in March, but judges at the Court of Appeal ruled the jail term was too long and gave her a nine-month suspended sentence instead.

McNally, of South Lanarkshire, first chatted to her victim online and kept up the ruse when the pair met in person in 2011.

They had relations using a sex toy and the younger girl, from London, believed she had lost her virginity.

McNally's counsel argued that judge James Patrick, who passed sentence in March, did not pay heed to her own youth and vulnerability, or give her credit for her decision to plead guilty.

Psychiatric reports found McNally had self-harmed and was having suicidal thoughts, the court heard.

Lord Justice Leveson, sitting with Mr Justice Kenneth Parker and Mr Justice Stewart, acknowledged the victim suffered substantial harm, describing the case as extremely difficult.

They imposed a two-year supervision order to go with the suspended sentence.

McNally spent 82 days at Holloway prison in London.