The mother of the teen called Victim 9 by prosecutors was the last witness called Monday before the state attorney general's office rested its case against the former Penn State assistant football coach.
The woman's son testified Thursday that Sandusky had repeatedly forced him to have anal sex that resulted in bleeding. The teen testified that he "just dealt with it."
Earlier, prosecutors dropped one of the 52 counts against Sandusky, saying the statute he was charged under did not apply at the time of the alleged illegal contact.
Sandusky denies the charges.
The defense began presenting its case by calling former Penn State assistant coach Dick Anderson.