He is powerless to resist

Ned fell back onto the bed, helplessly in ecstasy. The Queen continued her ministrations, bobbing up and down on Ned's cock with vigor, taking his entire length in her throat with each stroke.

"I shouldn't be here" Ned said, pleadingly, as he tried to lift himself off the bed. "Nonsense" Cersei said nonchalantly, pushing back. She disconnected her mouth from his groin, straightening herself out while pushing herself on top of Eddard, positioning herself over his cock.

The blonde Queen sank onto Eddard's stiff shaft, groaning as she accommodated his length. "You know I usually only let Jaime in here? The King hasn't been in here for years. That's why it's so tight." Cersei began to speed up, her ample buttocks slapping against Eddard's thighs noisily.

Ned was overwhelmed, delirious in a daze of new sensation, he felt a churning in his balls. "Cersei." The Queen reacted quickly, sliding lithely off of him and seizing his shaft with her hand, as he began to come, white jets falling onto her perfectly formed breasts and face.