Plymouth Crown Court heard how the couple had sex sessions while the girl was present, and that Gotham also performed sex acts on the girl.
They broadcast it live via Skype to Ellis, a former magician's assistant and dominatrix.
The Daily Mail reported that prosecutor Heather Hope said at the trial conducted in Plymouth that the victim was “most probably drugged at the time” and the evidence was “downright revolting”.
The prosecutor also said that the former couple engaged in about five live-stream acts from late 2012 to early 2013 and were referred to as “shows”.
Gotham at times would carry the abuse by herself in the house.
The abuses were only discovered after the FBI was looking into child abuse and stumbled a Skype name called Bad Girl Next Door, which led them to the woman in San Francisco and her engagement with the UK-based couple.
Forbes, who had admitted to three charges of sexual assault, possession of indecent images and breaching a sexual harm prevention order, was sentenced to eight years in prison."Forbes was also convicted on a separate offence of making indecent images of children and breaching his Sexual Harm Prevention Order, imposed in 2015, after a laptop was found hidden in a sofa at his home upon his arrest in 2016," Devon and Cornwall Police said in a statement.