One of three Fond du Lac residents convicted of the sexual assault of a six year old girl is going to prison. At a hearing Monday Fond du lac judge Peter Grimm sentenced Tory Tuinstra to 13 years in prison and 15 years extended supervision. In December Tuinstra pleaded no contest to an amended charge of second degree sexual assault of a child. Two others, Shane Berg and Ellen Neumann, were convicted in January of child sex assault and are scheduled to be sentenced in March. Assistant police chief Steve Thiry says the assaults allegedly occurred at a Ruggles Street residence. According to a criminal complaint Tuinstra described the lifestyle in the house as dominance/submissive. Thiry says Tuinstra told investigators that Berg was the dominant one and goes by the name Master Wolf. According to the complaint everyone in the house wore dog collars, including the six year old victim who wore a purple collar. Neumann made the child watch three adults have sex, according to the complaint.