Her shaking was what set him off. She smelled so good and the noises she was making were so fantastic, but it was the shaking, the vibrations around his cock that set off his own release. He moaned loudly as he continued to pound into her, clutching her body tightly his his own as he came.
"Fuck," he moaned as he finished, his thrusts slowing and his own shaking starting to calm down. Once he was finished, his body slumped against her, and he rolled over, pulling out of her to sprawl on the bed next to her body, glistening with sweat. "Well," he breathed once he was able to somewhat speak again. "That was fun."