District Attorney Stacy Parks Miller of Centre County said the plea deal ensures the victims will not suffer more trauma by testifying at the trial.
“We are happy that these girls can move forward and experience a life with adults that deserve their trust,” she said.
Mr. Sandusky, one of Jerry Sandusky’s six adopted children, has been a stalwart supporter of his father, who is serving a lengthy prison sentence for sexual abuse of 10 boys.
He regularly attended his father’s court proceedings alongside his mother, Dottie Sandusky, who also has consistently supported her husband and fought to clear his name.
Jeffrey Sandusky, a state prison guard, knew the girls through their mother, the authorities said.
A state trooper said in the arrest affidavit that last November, the father of the girls gave investigators text messages from Mr. Sandusky in which he asked one of them for nude photographs.
The affidavit said Mr. Sandusky told the girl in texts from March 2016 that “it’s not weird because he studied medicine” and instructed her “to not show these texts to anyone.”
The girl’s mother told investigators that when she confronted Mr. Sandusky, he told her “he knows it was wrong and inappropriate,” the police said.
The girl told the police that the texts made her uncomfortable and that “he kept pressuring me and asked me multiple times not to show the texts to anyone,” the police said.
Prosecutors allege that Mr. Sandusky sought oral sex from the other girl in 2013. She was 15 years old at the time.
That girl told investigators that Mr. Sandusky later told her, “I can’t even say anything except I’m sorry.”