BELLEFONTE, Pa. (AP) A son of former Penn State University assistant football coach Jerry Sandusky has pleaded guilty to pressuring a teenage girl to send him naked photos and asking her teen sister to give him oral sex.

Friday's plea deal comes a week before Jeffrey Sandusky's scheduled trial on 14 counts including solicitation of statutory sexual assault. As part of the deal the 41-year-old will spend up to six years in state prison, but the judge could impose as much as eight years.

Jeffrey Sandusky is a state prison guard and knew the girls through their mother.

He's among six adopted children of Jerry Sandusky and has been a stalwart supporter of his father, who's serving a lengthy prison sentence for a child sexual abuse conviction.

Jeffrey Sandusky's lawyer hasn't returned a call seeking comment.