A teenager allegedly trafficked to the UK and forced to work as a prostitute cried as she gave evidence in court.
The 19-year-old told the jury of her "agonising" experience having sex for the first time with a £40 customer.
Southwark Crown Court was told she worked 24-hours-a-day "entertaining" up to 20 men daily at the London brothel.
Flamur Demarku, brothers Agron and Bedari and another man, Izzet Fejzullah, deny prostitution and human trafficking charges.
The prosecution said in the month that followed she had hundreds of customers, earning tens of thousands of pounds for the defendants.
Flamur Demarku, 33, of Hall Road, Hounslow, west London
Argon Demarku, 21, of Hall Road, Hounslow
Bedari Demarku, 22, of Hanworth Road, Feltham, west London
Izzet Fejzullahu, 32, of Bell Road, Hounslow
It was only after a police investigation, triggered by the case of a 16-year-old schoolgirl, that led to her rescue.
The court has heard the allegedly family-run Albanian operation included a string of brothels predominantly staffed by eastern European women.
Michael Holland, prosecuting, said while some were willing, the rest were most definitely "unwilling".
They had been fed a string of lies to get them to Britain, he said.
The student, giving evidence via an interpreter from behind a screen, said she was eventually persuaded by a man to come to London after being promised a nice house and a good job as a barmaid.
She was met by Mr Izzet and Mr Argon at Heathrow airport and driven straight to a house, the court was told.
Inside, she told the jury, she was led into a room containing a number of women, also from Lithuania.
"The girls were walking around in nightdresses and then a man walked in, a client, and I asked what I was really there for," the court heard.
"They laughed and said: 'Prostitution'. I burst into tears. I said I don't want to do that and that I wanted to go home.
"But I was told I wouldn't leave before four months because I would have to work off a huge amount of money paid for my journey."
She told the court she began work as a prostitute the next day.