The boy said their conversation became increasingly sexual, and he began drinking vodka. He said, "Things started to blur," he blacked out and woke to find a Cook performing a sexual act on him.
A 16-year-old girl also took the stand, testifying that she went into the basement the following morning and saw the victim and Cook on a couch together.
A staff member in the Fort Cherry School District heard what happened and reported it to school officials and police, WPXI reported.
Authorities said that when they interviewed the victim, the boy said Cook often supplied him with alcohol and Cook directed him to tell police, if questioned, that the alcohol was windshield wiper fluid.
Police said the boy initially said the assault may have been a dream.
During cross examination, Cook's defense attorney questioned the victim, asking, "Why did you tell the police officer nothing happened?" "I just hoped I wouldn't need to explain the details of what happened. (I) kept telling myself it was a bad dream," the teen testified.
Cook was ordered to stand trial on all charges. As of Thursday morning, Cook remained on paid leave from the school district, WPXI reported.