"Game of Thrones" showrunners may have taken things a bit too far when they asked Lily Allen to take part in actual incest.

The British pop star is the sister to Alfie Allen, who plays Theon Greyjoy in the hit HBO series. Lily revealed during a Reddit Ask Me Anything she was offered the role of Yara Greyjoy, whom Theon touches sexually before knowing who she really is.

"Well, that was about a 5 year disparity between the two! But I've been asked to do a Game of Thrones cameo, they asked me if I'd be interested in playing Theon's sister, and I felt uncomfortable because I would have had to go on a horse and he would have touched me up and s***," Lily said. "Once they told me what was entailed, I said no thanks. I would be open to doing a musical cameo like Sigur Ros, though."

Alfie recently spoke Entertainment Weekly about his character's story in season four. Theon is broken and now goes by the name of Reek as Ramsay Snow has tortured him into taking on a new identity.

"It gets dark. I don't think people will find it as hard to watch this year," Alfie told EW. "It depends what kind of person you are. It's more of a mental torture than it is physical. It's daunting as an actor. I have to do more telling of the story with my eyes than with words. I've never really done that type before."

However, Allen took viewers inability to watch his torture scenes as a compliment as an actor.

"Really just empathy, although people who were close to me did tend to have a laugh," Alfie told EW, referring to the general reactions he received from season three. "People did say, 'It's so hard to watch,' and as an actor that's something you want to hear. I find that a compliment."

"Game of Thrones" airs on HBO Sundays at 9 p.m.