A man plotted to kill his adoptive parents with the help of a friend he met on the internet, a court has heard.
Christopher Monks, 24, wanted Shaun Skarnes to murder his parents Christopher and Elizabeth Monks while they slept and then perform an extreme sex act on him, Preston Crown Court was told.
The bisexual pair are alleged to have hatched the plot after meeting on an internet site about "Furries" – people who pretend to be animal characters and share sexual role-playing fantasies.
Skarnes, 19, visited Monks' family home in Preston Road, Clayton-le-Woods, near Chorley, in February after weeks of chatting to him online.
The two played computer games before Skarnes left, telling Mr and Mrs Monks he was getting the train home to Ellesmere Port, Cheshire, and thanking them for having him round.
Monks then watched a DVD with his parents while Skarnes waited for hours in a playpark nearby until he received a text from his friend, telling him the couple were asleep in the four-bedroom house they shared with their son.
Mr Monks woke in the early hours of the morning to find Skarnes beside his bed, clutching a kitchen knife.
He grappled with the intruder and yelled for help from his wife, who was sleeping downstairs.
Dad-of-three Mr Monks told the court: "I thought he was trying to kill me. My wife tried to hit him with a stick but it broke.
"She then began to talk to him in a calming way. At that point, his manner changed completely."
The couple went downstairs to find a police officer on the doorstep, who had responded to Mrs Monks' 999 call.
Mr Monks was left with bruised arms, a cut palm and bite marks.
Monks, who was downstairs during the attack, was initially treated as a witness but then later arrested.
Prosecutor Dennis Watson QC told the court that while Skarnes carried out the attack, ex-Runshaw College student Monks stayed downstairs, deleting "incriminating" text messages.
Mr Watson said Monks had talked about his sexual desire for his penis to be bitten off in online chatroom discussions.
He told the jury: "It may seem extreme that he wanted his penis bitten off, but there is ample evidence from websites he visited and conversations with Shaun Skarnes that this was a deeply held interest and one he found sexually stimulating.
"It seems that Skarnes was to receive no money for killing Mr and Mrs Monks but the prospect of biting off Monks' penis. This was the climactic act of the conspiracy."
Elizabeth Monks told the court that her adopted son was a quiet boy who never lost his temper and did well at his temping job at an educational training centre, where she also works.
Her husband added: "We have no doubt that (Christopher) did not intend to go to this extreme.There is no-one in our closest circle of friends who is not shocked at what has happened."
Skarnes, of Sutton Way, Ellesmere Port, and Monks both deny conspiracy to murder Mr and Mrs Monks.
>> Vote in our latest web poll
lepone: Every section and special feature can be found on a single page