A serving NSW Police officer bent the will of a supposed friend into providing him sexual favours under constant threats of exposure.

One night in 2014 the young woman went to Vaughan Hildebrand's Campbelltown home where his two large dogs were barking aggressively. She found him on the couch in the living room playing with a knife. He told her he had guns in the house, spinning a story about working undercover to infiltrate an outlaw motorcycle gang.

Former NSW police officer Vaughan Mark Hildebrand blackmailed four victims into having sexual intercourse, the NSW District Court has heard. Credit:Nine News

After a few hours she left, but as she drove away she received a text message: "x2". She knew what it meant, that she owed him for some perceived deception several years before and if she didn't comply with his demands, then he would distribute intimate photos of her to an expanding list of recipients.

When she returned that night Hildebrand was already masturbating. He grabbed her by the wrist and forced her to give him oral sex. When he had finished with her, he watched television.