LONDON - Richard Finlayson, 21 years old, and her sister Kirsty, 18, were caught by CCTV cameras at a railway station while having sex in an elevator.
The shocking 15-minute clip shows the two coming out of the elevator just to go back and have another soon after sexual intercourse. Exit the elevator for the second time, the movie shows that Richard's sister Kirsty a £ 20 note.
The couple has been arrested by police after a railway station Motherwell gave the alarm.
Last night a family friend said that these revelations have left the family of the couple "destroyed".
Richard and Kirsty had already admitted to being guilty of sexual acts in June last year.
Hamilton Sheriff Court heard the testimony of a boy of 11 years on the platform during their appointment illegal.
His sister denies having had sex for money, while Richard claims to have given her 20 pounds "as a brother and not for sex."
Last night a family friend said: "We are devastated, I was shocked when I heard about it. Most of the family knew nothing. I can not believe. And 'a nightmare'.
Brother and sister will be judged next month.