"Game of Thrones" cast Alfie Allen denied sister Lily Allen's claim that she was asked to do a cameo which she turned down after knowing about the incestuous scene. The 27-year-old actor admitted that playing Theon Greyjoy can be emotionally draining, however fulfilling it is.

"The only thing I'm going to say on that is that it's not true," he said, as reported by BBC.

The website said that the incestuous scene is in season 2 episode "The Night Lands" when Theon Greyjoy was fetched by his on-screen sister, Yara, played by Gemma Whelan. While they were on a horse, he touched her breasts from behind.

Lily Allen earlier said during the Reddit AMA session that he was offered the role but when she learned that she "would have had to go on a horse and he would have touched me up," she immediately turned down the invitation.

"Once they told me what was entailed, I said, 'No thanks,'" the singer said.

However, "Games of Thrones" cast Alfie Allen denied that it ever happened.

"Gemma Whelan was always their first choice for the part," he told Vulture. "And she's fantastic. And that's the only thing I'm going to say about that."

Meanwhile, "Game of Thrones" cast Alfie Allen told the magazine that playing Theon Greyjoy can be draining just because of the so many levels of emotions he's going through as the show progresses.

For now, he said, Theon Greyjoy is totally out as the Reek persona takes over as a defense mechanism for the character he plays.

"He's driven by fear and pain, and I don't think there's even any anger there," he said. "It's just fear and pain, and maybe the only times he can come back as Theon is when he's slightly angry. So he'd be two percent Theon now, when he's angry at himself, angry at the world

"I'm totally excited by that idea. I think there are moments where he revisits the state of mind of Theon again but I think right now, he's just totally Reek," he said.

"I don't know if I'll get a chance to play a character like this again, but it's a horrible state of mind to be in, without a doubt," "Game of Thrones" cast Alfie Allen said.