The court heard Mr Frampton had been performing at The Bullingdon music venue in Oxford city centre the previous evening.
After meeting fans afterwards, he went back to his tour bus before being invited to a party at a house where one of the female group lived.
The first woman told the jury she had gone onto the roof of that property with the second woman, Mr Blake-Walker and Mr Frampton.
She said after talking they began kissing consensually, but then Blake-Walker forced her to perform a sex act upon him.
Sheryl Nwosu, representing Mr Blake-Walker, suggested the consensual kissing led to consensual oral sex.
"Not willingly," the woman replied.
"When he pushed me down, I said I didn't want to do that. I said repeatedly I wanted to go back inside."
Denying she was embarrassed, she described why she fled the house, telling the jury: "I wanted to get myself out of a very scary situation."
In a recorded interview with the police, the complainant said she had been "excited" Frampton was going to the house.
The trial continues.