A man is being made to pay for his unbelievably criminal act after forcing his lover to do unimaginable things to her son.

A man who forced his partner to perform s*x acts on her nine-year-old son has been jailed indefinitely, Metro UK reports.

The convicted paedophile, who cannot be named for legal reasons, also threatened the woman with a pitch fork because he was ‘dissatisfied’ with her performance.

He was first jailed for 16 years in 2001 but was due to be released before a supreme court judge in A Judge Bruce McPherson told the court how ‘in his 20 years’ he had not seen a case ‘in which the conduct of the accused was worse than this’.

The hearing heard how he forced his partner to perform the indecent acts as he filmed with the aim of setting up a pornography business, reports the Brisbane Times.

He also forced her into group s*x and also abused her young son himself.

He also beat the woman so badly it left her with brain damage, face fractures and badly damaged left ear.

The man was convicted of indecently dealing with and maintaining a s*xual relationship with a child as well as assault occasioning bodily harm. Australia this week upheld a decision that would see him remain in prison indefinitely.