" Panting, she pressed closer to him as he unfastened the row of buttons and freed his swollen erection. With a soothing murmur, Ross positioned her over his hips, canting them to just the right angle. She sank down eagerly, gasping as he filled her completely. Her hands clutched at the fabric of his coat, fingertips digging into the smooth broadcloth.
"Hold onto me," he whispered. When she had wrapped herself around him, he picked his feet up from the stepping board and let the chamber-horse seat drop several inches in a sudden electrifying jolt. The movement forced Sophia harder onto the hilt of his shaft, and she whimpered in pleasure.
Ross smiled as he stared into her wide, unfocused eyes. Color burnished the edges of his cheekbones and the bridge of his nose, and sweat misted his skin. His thighs went taut as he braced his feet on the board once more, then let them drop again. "Is this all right?" he murmured. "Is it too much?"
"No," she gulped. "Do it again."
Obligingly he began a bouncing motion that elicited a rhythmic squeak from the chamber horse. Air rushed from the contraction and expansion of the cushions like the sighing of fireplace bellows. Sophia held on tightly, her body gripping his intimately. Each drop of the seat caused the stiff, thick shaft to push harder inside her, again, again, until the stroking, grinding motion caused her to convulse in a release that had no end.
Feeling the spasms of her body, Ross impaled her one last time and groaned in satisfaction. When at least he leaned backward with her body clasped in his arms, Sophia draped herself over him, utterly relaxed. Their bodies were still joined , and she moaned as he flexed inside her. "

― Lisa Kleypas , Lady Sophia's Lover (Bow Street Runners, #2)