The girl would visit the couple's Ballarat flat, where they would consume alcohol and drugs together.

On one of her visits, the 14-year-old was given a tablet, cannabis and alcohol before the couple abused and raped her.

The girl asked Lavery to stop, and Sharman also tried to intervene, but she continued.

The victim reported the offending to police in 2016.

She continues to carry the scars of what happened and will have to live with them for the rest of her life, she told the court in a statement.

"I was a young girl looking for friendship from someone that I loved, because I had known her since I was young," she said, about Lavery. 

"They took advantage and abuse me to satisfy their lust without any concern for how I was being hurt and damaged or how it would affect my life."

Lavery was charged with the most offences, seven charges including rape, while Sharman was charged with one count of sexual penetration with a person aged between 10 and 16.

The pair, who are no longer in a relationship, faced a jury trial in April where they were found guilty of all offences.

Judge Claire Quin handed Lavery an immediate prison term of four years and two months, with a non-parole period of 18 months.

Sharman walked free from court after being handed an 18-month sentence, which was wholly suspended for two years.

"You both took advantage of a young girl who was craving acceptance and participated in cruel and sexual offending," she said.

Lavery will be registered as a sex offender for life, while Sharman will be registered for 15 years.

1800 RESPECT (1800 737 732)

National Sexual Abuse and Redress Support Service 1800 211 028