The man dubbed the 'Beast of Blenheim' has today denied writing a story found in his prison cell, featuring bestiality and abuse of a young girl.

The typed story titled Animal Antics was today put forward in the High Court in Christchurch as an example of Stewart Murray Wilson's "deviant" behaviour as the Department of Corrections seeks an extended supervision order upon his scheduled release from prison in September.

Wilson, 65, has been in jail for a total of 18 years for various sex offences including bestiality. He denies all of the offending.

The Department of Corrections argues Wilson poses an ongoing high risk of reoffending.

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The court was told today that the typed story found in Wilson's cell in 1999 or 2000 detailed a "forceful sexual interaction".

One part of the story read: "If you love something, set it free. If it doesn't come back to you, hunt it down".

Wilson, appearing via a video link today from prison, denied he wrote the story. He said other inmates had access to his typewriter in his cell.

"I read it today and I was thoroughly disgusted with it," Wilson said. "I asked the officer with me to destroy it."

Wilson agreed he would sometimes type in all capital letters, as this story was.

He said he was not aware of any links in the story with his real life offending.

Clinical psychologist Jane Freeman-Brown told the court Wilson had been unwilling to accept any psychological intervention in prison.

He was a "fairly rare offender" with a high level of deviancy and psychopathy.

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His risk was likely to remain the same in coming years, despite his age, and he had "poor impulse control".

At the conclusion of today's court hearing, Justice Graham Lang reserved his decision, saying it was important for Wilson and the community at large.

He will deliver his finding in writing.