A man in Australia hoping to film paranormal activity got more than he bargained for when he discovered that his 28-year-old girlfriend was having sex with his 16-year-old son.

The Mercury reported on Monday that the Tasmanian man had forgotten to turn off a camera that he had set up to catch paranormal activity. When he returned home from work, the footage revealed that the girlfriend and the son had been engaging in an intimate relationship.

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The girlfriend, who could not be named for legal reasons, admitted that she had sex with the boy at least three times in recent days. The woman also later told police that she knew the boy was 16, but did not know that the age of consent was 17.

Defense lawyer Steve Chopping said that the 11-year relationship between the father and the girlfriend had ended over the affair, which included sex with the boy at a hotel in another part of the state.

The woman pleaded guilty to five counts of sex with a minor. She was expected to be sentenced on Monday.

[Stock Photo: “boy and girl are hiding under the blanket.” via Shutterstock]