He let out a choked sound of his own, freezing still when she grabbed his hand. Eyes closing, he took a deep breath and nodded, taking hold of her hand and lifting it up so he could kiss her fingers, pressing her palm against his jaw briefly.

"Don't worry. I'll go slow."

Actually he didn't move much at first, feeling her muscles stretch around him, only pushing forward another inch when she didn't feel quite so tense anymore. Then he stopped again, waiting, giving her the time to adjust, only moving once she told him he could. Hurting Mary was anathema to him.