He said the boy was at "no stage consenting" to the act and "just froze".
"He was out of his depth and didn't know what was going on."
Judge Neave said the incident showed a monumental lack of judgement and thought on the part of the defendant.
He said the effects on the boy had been significant and the victim was "mortified" at having to relive the incident through the trial.
"He still doesn't like having his photo taken or being in videos. He is yet to tell all of his family what has happened and may never be able to do so."
The judge took into account character references for the defendant and noted his prominent role in the community.
The man's fall from grace would be even greater when his name was released in November.
Judge Neave said the man still showed a lack of understanding or remorse and "he had only himself to blame" for his sentence.
He said if the man had pleaded guilty at an earlier date he would have had some credit during sentencing.
The man's lawyer, Roger Philip, said the offending was "opportunistic".