McKlain haden't expected her to use her body in such a way and was very nearly thrown off. However, he had the high ground and is center of gravity was higher than hers. She would have to arch a lot higher than that to accomplish much.
For his part, McKlain spread his legs to widen his stance and provide for more stability. He stayed on her, even if her nails drew blood from his fist. But there was only so much she could do with her nails. And, with the way he was stradling her, the more she arched like that, the more he was likely to enjoy it.
"So," he said in a breathey, but not as winded, tone. "Are you ready to submit to me?"
He tightened his grip on her neck and forced her chin up, moving her lips minutely closer to his. It was obvious that he was enjoying this greatly. That he was nearly caught up in just how awesome he was. But there was something more to his expression.
As much as it would piss anybody off, he wore a smug look that implied she, too, would enjoy submission. He just had that way about him.