"Are you trying to claim purity?" he demanded. "At this hour? Everyone knows about you and Lancelot, everyone but your foolish husband. Say it!" He seized her by the back of her copper hair. "Say you were unfaithful, no more loyal than me!"
"It- it is not true," she said through the pain. He twisted her hair, but she managed (just barely) not to cry. "It is true, I looked at him as a married woman should not. It is true, we spoke to one another in private, and there were times I had thoughts about- about what might have been. But I never touched him. Kill me if you wish, but it is the truth."
The pain subsided for a moment as Mordred's hands went to her chin again, and he gazed into her eyes. "By the devil", he whispered. "I think you might be telling the truth! How appropriate, then, that this will be your first time committing adultery."
Guinevere's stomach tied in a knot. It was what she'd feared, but some part of her had hoped he would not go through with it. His own father's wife! A part of her wished that he had simply slit her throat and had done with it all, while another part gasped in relief that her life would be prolonged, even for an hour.
But more than fear or relief, what she felt was a numb dread. Even when she had been in danger in the past, no one had ever dared ravish her- it would have meant war against one of the most powerful armies in the world. But that army was far away now, chasing Galahad's vision of the grail. There was no one save a few remaining sentries to protect her, and Mordred had clearly made short work of them. She hoped her fellow ladies had managed to flee when the coup started, but it was now far too late for her to do so.
"Everyone thinks they can take what is mine," Mordred snarled amid the clanking of armor being tossed aside. "My brothers, my aunt, my father. They all think themselves better than me. Well, you shall know the truth tonight."
And with that, he fell upon her. She could still smell the metal from the armor on his bare hands as he held her down on the floor, still taste the blood in his mouth as he kissed her. She pushed up against his grasp, less out of a genuine expectation that she could outfight him than out of panicked desperation. This was happening, this was really happening. The worst thing, as she'd been told since her girlhood, was to have her honor taken, and there was no way she could stop it now.