Jamie Tonkin, 23, created a web of lies including telling the victim that a girl would have sex with him – but Tonkin told the victim he had to perform oral sex on him first.
Tonkin, of High Street in Falmouth, appeared at Truro Crown Court for sentence after pleading guilty to three charges of causing a person with a mental disorder to engage in sexual activity.
Prosecuting the case, Piers Norsworthy described how on four occasions Tonkin “induced, threatened or deceived” his vulnerable victim to perform oral sex on him.
Tonkin’s sinister plot was eventually rumbled when the victim’s parents found messages and overheard a phone call when the victim told a friend what Tonkin had forced him into.
Mr Norsworthy told the court how Tonkin falsely claimed to be in a sexual relationship with a girl who the victim liked.
Tonkin told the victim that she would have sex with him, but in return he had to perform oral sex on Tonkin first.
According to Tonkin, the girl set how long he must perform the sex acts for and stipulated that he must take off his clothes.
On one of the occasions Tonkin ejaculated and he also spoke about anal sex, although this never came to fruition.
In order to further his lie, Tonkin would tell the victim made-up stories of what him and the girl were doing sexually.
The court also heard how Tonkin had in the past received a caution for a sexual assault carried out on a girl under 13.
Sentencing Tonkin, Judge Simon Carr said: “The circumstances in this case are unusual, possibly unique.
“As a teenager, as with all teenagers, [the victim] had an interest in a person from the opposite sex but found it difficult to approach them.
“You created a complex situation to fulfil your own sexual needs. You told the victim over hundreds, if not thousands of messages and in person that you were having sex with her.
“You told him what it consisted of and indicated that she was keen on him and created fake message threads in which she appeared to have said she’d be willing to have sex with him if he performed sex acts on you.
“On four occasions you coerced and threatened him into performing sex acts on you and he only did this because he believed it was what she wanted and would bring him closer to her. All of these acts were performed against his will.”
Tonkin was jailed for five years.