The prosecution in a child rape proceeding against former Penn State University assistant football coach Jerry Sandusky could finish by Friday, the judge said Wednesday.

"Things are moving along quicker than anticipated," Pennsylvania judge John Cleland said before ending the day's proceedings.

In an emotion filled courtroom, jurors on Wednesday heard graphic testimony from three alleged victims, the father of a then-graduate assistant who said he witnessed Jerry Sandusky raping a boy, and a janitor who testified that he saw two pairs of legs in a shower, believed to belong to the ex-coach and a child.

After he saw the legs, Ron Petrosky said another janitor named Jim Calhoun -- who suffers from dementia and isn't able to testify -- claims witnessed the boy performing oral sex on Sandusky; testimony that defense attorney Joe Amendola sought to make inadmissible.

The men spoke on the third day of the case against the former assistant football coach, who's pleaded not guilty to the 52 criminal counts and has denied his interactions with the children were sexual.

Five of 10 alleged victims have so far testified, whom prosecutors say were sexually abused over a span of 15 years. Two of the boys are not expected to take the stand.

Among those who testified Wednesday was a 25-year-old man identified as Victim 10, who said that as a boy, he was sexually abused by Sandusky. Sandusky told him that if he told anybody, he would "never see my family again."

At another point, the man said, Sandusky seemed to apologize: "He said that he didn't mean it, and that he loved me."

He testified that the former football coach sexually abused him on at least five different occasions in the basement of his central Pennsylvania home, pinning him down and engaging in oral sex.

Sandusky, meanwhile, sat nearly expressionless during Wednesday's proceeding, listening intently during a trial that was initially expected to continue for three weeks but has since progressed more rapidly than expected.

Earlier Wednesday morning, John McQueary, the father of a then-graduate assistant who says he witnessed a rape, also took the stand.

"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 (was) 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 scientist to figure out what was going on.' "

A day before, 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 on 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."

Prosecutors claim Schultz held a secret file that detailed alleged incidents pertinent to the Sandusky investigation, which was initially not made available to the grand jury investigation.

Schultz and Tim Curley, Penn State's former athletic director, have pleaded not guilty to charges of perjury and failing to report an alleged sexual assault of a child.

The file allegedly shows inconsistencies with what Schultz and Curley told a grand jury, according to court documents filed by prosecutors.

They say emails from Schultz, Curley and others further contradict their testimony, though CNN cannot independently confirm that account.

The university responded Tuesday saying that it had received "several subpoenas and gathered documents from many sources across the institution."

"As soon as any relevant documents were discovered, the university immediately provided them to the office of the attorney general and the Freeh Group," it said, referencing an independent investigation.