and then jill was trembling beneath him , her back bowing upward , her cries of pleasure louder , faster , her nails deeper into his ass through his flight suit , and damn what a time to realize they 'd been so hot for each other they had n't even gotten out of their clothes- his release slammed through him , knocked him off balance , and he sank on top of her with a final heart-deep thrust that left him shaking as he buried his face in her hair .