Entertainment Tonight ET Online ETOnline.com

As Liberace's larger-than-life story is set to hit the big screen in 2013, Scott Thorson, a former lover of the flamboyant entertainer, gives insight into the fascinating world of the late performer.

ET's special correspondent Christina McLarty sat down with Thorson, currently known as Jess Marlow, who became lovers with Liberace at the tender age of 16. In 1988, he wrote the book Behind the Candelabra: My Life with Liberace in which he detailed his life with the famous singer. He is presently working on a follow-up.

VIDEO: Michael Douglas' Piano Skills Improve for Liberace

"It was strange-- it was kind of like a father/son relationship," explains Thorson. "But we had sex."

The now 54-year-old reveals that Liberace insisted that Thorson undergo plastic surgery to look like him during their then-secret romance, which lasted five years.

"He had a doctor fly from Beverly Hills …And he had a big portrait on the wall of himself. [Pointing to the picture] he said, 'I want you to make him look like he's my son.'"

VIDEO: Michael Douglas Reflects on His Cancer Battle

Although he "was shocked" at first, Thorson says he relented to Liberace's request. "I would do anything to please him," he admits.

Steven Soderbergh and HBO films are currently producing Thorson's story with Michael Douglas playing the lead role of Liberace and Matt Damon slated as his young boyfriend.

Tune in to ET for more of our special interview with Scott Thorson tonight and tomorrow night. Check your local listings.