Constand, 44, had been an employee of Temple University's athletics department at the time, which is how she said she met Cosby, in 2001. "When I felt that, I leaned forward and he took his hand away...'I said I'm not here for that, I don't want that'". "I felt him take my hand and place it on his penis and move it back and forth", she told prosecutors, the Los Angeles Times reported. The 79-year-old comedian once dubbed America's Dad could spend the rest of his life in prison if convicted.
When Mr Cosby started inviting her over for dinner, Ms Constand said, she thought he was trying to help her fit in after her recent move.
"I felt really humiliated and I was really confused", she said after gathering herself together. Under the terms of that settlement, Constand was unable to speak publicly about the alleged assault until her courtroom testimony on Tuesday.
Other details of Constand's account also shifted in statements to police and in a deposition during her civil lawsuit in 2005.
Cosby has faced allegations of sexual assault from dozens of women, though Constand's accusation is the only one to lead to criminal charges. She testified she had responded that she did not. "And I believed he supported numerous athletic programs", Constand said. Ms Constand's case is the only one in which Cosby has been charged.
Constand is expected to take the stand again on Wednesday. She said that when she awoke, her breast was exposed, and a naked Cosby forced her to sexually gratify him with her hand.
Upon leaving the courtroom, Cosby laughed and said "Hey, Hey, Hey", his Fat Albert catchphrase, apparently in reply to an onlooker who was singing the theme song from the 1970s cartoon.More news: Selling pressure, caution over GST dent equity markets
Constand was direct and polite under cross-examination, even when Cosby lawyer Angela Agrusa's questioning grew pointed and accusatory.
Constand has told jurors how her professional relationship with the Temple University trustee evolved into a friendship.
Months later, Cosby reportedly left four tickets for Constand and her family to attend one of his shows. "A mentor", she said.
Earlier as Cosby arrived at the court for the second day of his trial, he turned entertainer as a woman with a camera shouted to him to wish her a happy birthday. Constand says she didn't tell anyone what happened out of loyalty to the women's basketball team which she managed at the time.
She said she feared speaking out at the time because Cosby was "the biggest celebrity in the world". While Cosby's lawyers hope this will show their client's innocence, Constand had another explanation for any differences in her stories. "She can't move, she can't talk".
"The absence of Camille Cosby is noted, usually a person charged with a crime, their spouse comes to show support for them", said attorney Gloria Allred, who represents 33 Cosby accusers. He said Ms Johnson made the disclosure while pursuing a claim that she had developed debilitating stress from her secretarial job at the William Morris Agency.
The AP does not typically identify people who say they are sexual assault victims unless they grant permission, which Johnson has done.