A jury found the offender, who cannot be named, guilty of six indecent acts involving his neighbour's child between 2011 and 2014.

The child had played with the offender's own children, and often slept over at the man's house.

One sleepover took place a night before the children were to go to entertainment centre TunzaFun.

The offender's son fell asleep, and he asked the neighbour's child if he could touch his genitals. He threatened to stop him going to TunzaFun if he didn't do so. The child agreed, and the offender touched him indecently.

In another incident, the offender played the board game Trouble with the child and, upon losing, "dared" himself to do a nudie run in the victim's presence.

Another game of Trouble saw the man dare the child to allow the offender touch him. He said words to the effect of:

"Now, this time I've won. I want to do something to you. I want to touch you."

"I dare you to let me touch you."

The man fought the charges at trial, and the jury acquitted him of six other counts relating to the victim's brother.

The ACT Supreme Court on Wednesday sentenced the offender to four years and two months for the indecent acts.

Acting Justice David Robinson set a non-parole period of two years and six months, making the offender eligible for release in January 2018.

The offences had a devastating impact on the family. In victim impact statements, the victim and his mother spoke of their stress, anxiety, damaged relationships, problems with schooling, and deteriorating mental health.

The offender has not acknowledged any guilt for the offences.

He still disputes the allegations, and showed no empathy to the victim in a pre-sentence report.