“He was prepared to do anything the defendant suggested to realise that ambition.”
Billiard also took the teenager and another athlete on a trip to Florida.
He abused him while they shared a hotel bed.
There was also a trip to a nightclub when Billiard, who was in the company of another officer, indecently touched the victim in a car after he got drunk.
Mr Grice said Billiard gave the victim cash and took him on shopping trips.
He said the abuse stopped after the teenager suffered injury problems and left the club.
Passing sentence, Judge Simon Drew QC told Billiard: “There are two significant aggravating features in this case.
“The first is that it involved a breach of trust.
“You were a coach in your late 20’s and early 30’s and the complainant was a young teenage boy.
“There is the obvious and clear impact that this conduct has had on the victim and the relationship with his wife.”
The judge said he had taken into account the testimonials he had heard, which spoke of Billiard in the highest of terms, and also his 30 years of service in the police force.