Young man raped girl, 16, in her bedroom and took pictures of her genitals after watching 'sleeping girls' pornography and googling 'how to not wake someone up' 

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Samuel Robert Aldrich, 19 broke into a 16-year-old's bedroom and raped her after watching pornography about sleeping girls

A young man broke into a 16-year-old's bedroom and raped her after taking photos of her Melbourne home and watching pornography about sleeping girls.

Samuel Robert Aldrich, 19, didn't know his victim and no one can explain why he decided to attack her in May this year.

He took photos of her family's Cheltenham home and car, four days before the attack.

Aldrich googled 'How to make sure you don't wake someone up' and watched pornography about sleeping girls before approaching the home where his victim slept in a bungalow at the back.

He stayed in her backyard for about an hour before leaving, but alerted the girl's father who went to investigate.

'I saw a guy walking normally along the footpath on the other side of fence and I yelled out to him,' her father said. 

'No, it wasn't me,' Aldrich replied calmly when approached by the father, the County Court of Victoria heard on Wednesday. 

'I got comfort, I didn't think it was him because he was so calm, so relaxed,' the father said.

He said he was on edge following the encounter, but eventually fell asleep about 1.30am.

The court heard that Aldrich went home to watch more of the same porn before returning about 1.30am.

His victim woke to find him crouched near her bed, and Aldrich told her to 'shoosh' and that he had a knife.

The victim's father, left, approached Aldrich on the night of the rape after hearing someone down the side of the house 

Senior Sergeant Jason Walsh the man had 'disturbing' conversations with his victim when he assaulted her

The 19-year-old took photos of her family's Cheltenham home and car, four days before the attack

What followed was a prolonged episode of digital rape and sexual abuse, with the victim pleading for him to stop while also talking to him to avoid being harmed, Crown prosecutor Susan Borg told Aldrich's plea hearing.

Aldrich took photos of the victim's genital area, also talking to her after the attack and offering her money.

He fled, but handed himself in to police days later after seeing media reports about the incident.

Defence barrister Justin Hannebery admitted the offending was very serious.

He said Aldrich was remorseful and, as a young offender, had prospects for rehabilitation.

Aldrich fled the scene, but handed himself in to police days later after seeing media reports about the incident

Aldrich, who was supported in court by his parents and extended family, has no prior criminal history.

He was recently diagnosed with autism spectrum disorder, something he had not received treatment for in the past.

Judge Susan Pullen, who described the incident as 'hell' for the victim, will sentence Aldrich next week.

'A complete stranger, sexually mauling her,' she said.

'It must have been frightening.'

Aldrich pleaded guilty to one count each of rape and aggravated burglary, and three counts of indecent assault.