A pensioner faces up to 10 years in prison after he was found guilty of the repeated rape of a disabled man over a period of four years.
Christopher Fallon, 71, tricked the vulnerable man in order to rape him for what prosecutors believe could have been anything up to 150 times.
Fallon abused and raped the man with learning difficulties two or three times a week under cover of intimate massages which were meant to treat a chronic condition.
The adult victim had so many difficulties that he could not see he was being abused.
Plymouth Crown Court heard that when the man became suspicious he was afraid to say no to Fallon because he feared that he would be charged for the massages.
Fallon, of Plymouth, Devon, denied 18 counts of sexual abuse, and told the court that he never massaged the man nor touch him indecently.
But he was found guilty of four counts of rape, 10 of sexual assault and four of causing a person to engage in sexual activity.
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A judge remanded him in custody until sentencing next month while a probation officer assesses the danger he poses.
Recorder Richard Shepherd went on to thank the jury and urge them to seek counselling if they were troubled by the details of the case.
Fallon, who was previously married and has children, is to be sentenced at Exeter Crown Court on 17 February.