• He made the first move when he was alone with the girl at home 
  • The accused also tried to convince his partner of his "innocence"  
  • His actions damaged the relationship between the victim and her mother

A man has been jailed for sending lewd messages and offering to show a sex act to his 13-year-old stepdaughter, in a bid to groom her.

The Adelaide Supreme Court Friday convicted the man on charges of aggravated communicating with the intention of making a child amenable to sexual activity, reports Perth Now.

The man in his 30s, whose identity has not been revealed, texted the girl to establish a rapport with her and offered to "fool around" and "try first n second base," the court heard.

The girl's mother was the accused's partner and the couple shared three children.

The stepfather made the first move on the girl in Nov. 2018 when they were alone at home. On noticing that she was texting her boyfriend, the step-father asked her if she had gone to "first and second base". When she claimed ignorance, he explained and raised the topic of the sex act.

He then asked whether "she had given or seen one", had her first kiss, or watched porn. He offered to show her how everything is done, but the girl refused.

Though the victim was shaken, she thought he was “being silly” as he was drunk, said Judge Simon Stretton.

However, the accused contacted her again two weeks later. He complimented her looks and apologized for his past behavior.

When the girl replied she wasn't bothered, the man "took that as a green light,” the judge added.

“She said she had not further considered your offer. This only caused you to persist, introducing pathos to further your rapport with her by sending a sad face in response to her saying that she had not further considered your offer. You knew exactly what you were doing and how wrong it was because you then demanded by proof of photograph that you were speaking with the victim," the judge said.

The court was told that the stepdad also urged the girl not to reveal the messages to anyone. He also made another offer: "Like fooling around n trying first n second base.”

The accused also tried to convince or manipulate his partner into thinking his actions were innocent. “The plain fact of the matter is that your offending, convincing the mother of your innocence and causing her to side with you against her own daughter, is the catalyst for the destruction of their relationship and her estrangement from (her) siblings,” Judge Stretton said.

This affected the girl's ability to trust people. She also suffered from depression and anxiety, the court said.

The infant’s father called 911 after he received threat message from the suspect about the scene he would see when he comes back home. Pixabay