Bellefonte, Pennsylvania (CNN)

Bellefonte, Pennsylvania (CNN) -- Jerry Sandusky allegedly sexually abused a boy, threatened him and then later apologized, telling the child that he loved him and that he didn't mean it, the alleged victim testified on Wednesday.

The man, now 25, spoke on the third day of testimony in the high profile child rape case against Penn State's former defensive coordinator. He is one of 10 boys, prosecutors say, who were sexually abused over a span of 15 years by the former coach.

"He told me that if I told anybody, that I would never see my family again," said the man identified as "Alleged Victim No. 10."

He testified the school's longtime assistant football coach sexually abused him on at least five different occasions in the basement of his central Pennsylvania home, pinning him down and engaged in oral sex.

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"He said that he didn't mean it, and that he loved me," the man said.

Sandusky, who seemed expressionless during Wednesday's proceeding, has pleaded not guilty to 52 criminal counts and denied his interactions with the children were sexual. The trial is expected to continue for about three weeks, though court observers say the proceeding has moved at a rapid pace.

John McQueary, the father of a then-graduate assistant who testified he saw Sandusky raping a boy in a university shower, also took the stand Wednesday morning.

"I knew there was something wrong," the elder McQueary said, describing a phone conversation with his son following the alleged incident.

"I said, 'What's the matter?,' " McQueary recalled. His son, Mike, then told him: "Coach Sandusky in the shower with a young boy," he testified.

The former coach "was positioned behind the young man, and I believe he said up against the shower wall," McQueary added. "He said, 'It didn't take a rocket scientists to figure out what was going on.' "

On Tuesday, Mike McQueary testified that he saw what appeared to be Sandusky having anal sex with the boy.

He said he had informed university officials, though didn't use the words "anal sex" because he "didn't feel comfortable."

Defense attorney Karl Rominger cross-examined the younger McQueary Tuesday, asking him about angles of his view and the reported date of the alleged incident, which prosecutors had to adjust from 2002 to 2001.

The elder McQueary also testified Wednesday that he met with Gary Schultz, the former Penn State vice president who oversaw campus police, to follow up on what his son had told authorities.

"I made Mr. Schultz aware that I knew of this incident, and understood that Mike had met with him, and he had told Coach (Joe) Paterno," he said. "Mr. Schultz said that he had heard noise about this before, earlier than Mike's report."