The alleged victim told how 53-year-old Mohamed Amrani was still in his scrubs as he forced his tongue in her mouth and kissed her neck and ears.
She told jurors how the consultant surgeon then stripped her naked and said 'I'm going to f*** you,' then sexually assaulted her.
The alleged victim, who cannot be identified for legal reasons, is one of four women he is said to have attacked during a campaign of 'sexual bullying' at the hospital between 2001 and 2014.
When she begged him 'please don't do that', Amrani turned her around and said he was going to have sex with her from behind, the Old Bailey heard.
He then sat her down on the sofa in his office at Harefield Hospital in Hillingdon, west London and forced her to perform a sex act, jurors were told.
She said she felt she was left 'very, very shaken' after the attack and felt she could not report the incident because of Amrani's position at the hospital, where his wife Clare worked part-time.
Amrani was finally reported to police in 2015 - by which time he had allegedly patted the bottom of a fifth victim at the Cromwell private hospital in Kensington, west London, in June 2014.
Prosecutors claim he carried out the assaults over 13 years and believed his position as one of Britain’s leading surgeons meant his victims would never dare to complain.
He denies all the attacks and any sexual contact with the women, and claims they have invented the accusations against him.
Today, Amrani's third alleged victim described him as 'an absolutely brilliant surgeon' who had helped when her child fell ill.
'He started saying: "You owe me for the help I gave you. Remember, you owe me",' she told jurors.
'He said it in a jovial, jolly way and I just never thought anything.'
The woman described how she was walking to Amrani's office on September 4 2013.
'Then he said to me, "you owe me, you owe me, you owe me", delivered in a very jovial way. I didn't think anything of it,' she explained.
She sat on a sofa in Amrani's office, while he took a seat at his computer.
'He came off the computer and came over to me while I was on the sofa. He leaned over and started kissing me,' the woman said.
He then stood up and flicked the lock on the office door, the court heard.
'Then he came back over and started kissing me again. I didn't move at all. I was completely still, completely frozen,' the alleged victim continued.
'He was trying to push his tongue inside my mouth. He then started kissing my neck and ears. It was a horrible sensation.
'Then he pulled me up off the sofa so I was in a standing position.'
She said: 'I remember that he smelled of coffee,' adding: 'Every time I go into a room that smells of coffee it brings it all back.'
The woman said she did not fight Amrani off as he undressed her before sexually assaulted her.
Describing the ordeal, she added: 'He then turned me back around and pushed me down on the sofa when he was stood right in front of me.'
Jurors were told how Amrani forced her to perform oral sex on him before his phone rang.
He answered 'hello', tied up his operating theatre 'scrubs' and left the room, the court heard.
The alleged victim added: 'I just thought to myself at that time, "there's no way I can report this".
On Tuesday, another victim told the court that she was attacked in 2002, when Amrani allegedly ‘reached out’ to grab her breasts. She said she had not made a formal complaint because ‘the surgeons are all powerful’, and she feared she would not be taken seriously.
It is also alleged that Amrani had grabbed another woman’s breasts in a hospital corridor in 2014.
She also did not make a formal complaint, the court heard, but he later said to her 'you do realise I will f**** you sooner or later', and she subsequently told the police.
The fifth victim also alleged she had been patted on the bottom by Amrani at the Cromwell private hospital on 7 June 2014. She tried to slap him across the face but he ducked, jurors heard.
Amrani, from Harrow, northwest London, denies one count of rape, one count of assault by penetration, six counts of indecent assault and three counts of sexual assault.
The trial continues.