He moved her legs to pin them open as wide as he could, holding her thighs tight her leverage as he started pounding into her. The legs of hos desk scraped a bit against the floor, and he tried to pin her down further to use the weight to keep the desk still.
She arched off the desk as she suddenly climaxed, she managed to muffle her cries before she pushed him back, and sat herself back on the floor before pulling him close and swallowing him down to the base again.