Judge Denis Watson said he had to give Mason credit for pleading guilty, 'There is no real purpose imposing what would seem to everybody to be a ridiculously short sentence.'
Liverpool Crown Court heard that when the victim was a teen, Mason confessed to him but he made no report to police.
The victim recalled the abuse, when Mason took off both their clothes and said: 'I'll do it to you and you do it to me.'
The victim has gone on to suffer nightmares and bed-wetting for over a decade, he told the court: 'Having to live and cope with what has happened to me has been and still is an everyday struggle.'
Nicholas Walker, Mason's defence attorney, said Mason was 'deeply sorry'.