He spread her belly-down across the surface of the desk; her feet slid apart as they arched up on tip-toe. Then he took the hem of her skirt, and peeled it up slowly to expose her upward-thrust buttocks. There was no underwear to impede his intrusions: she'd know by lunchtime what she wanted, and removed her knickers slyly even while composing the message to summon him. She wore nothing but bare, smooth skin between the tops of her thigh-highs and the skirt's new line across her tail bone. Every inch of it tensed expectantly. He took advantage, trailing electric fingertips up the inside of her thigh to begin probing the sensitive folds above. He took his sweet time as he began to coax forth her sweeter nectar.
Her eyes were still closed, and in any case she was facing the wrong way to see exactly what he was up to behind her. She didn't want to peek, preferring the excitement of mystery, and in any case he wouldn't have allowed her to do so. Thus, all she got was a bare moment's warning as his fingers suddenly disappeared, before they were replaced by something altogether thicker and more rigid. There was no pause to spare her feelings before the fat, meaty tip of the invader plunged forward to spear into her engorged entrance. A forceful impulse seemed to lurch forward inside her in time with his thrust, spurred on by his sudden momentum. By the time he hit his stride, their bodies were moving effortlessly together with each stroke.
With one hand, he lifted her bound wrists behind her; the lever of her arms forced her body down further to squirm over the desk as she was taken. The fingers of his other slipped up into her hair and closed around a large handful, tugging tight. Controlling her utterly with all three points of contact, he began to hammer away at her without restraint or remorse. As multiple overlapping judders of sensation shivered over her body and along her spine, she felt herself sinking gradually down until she was entirely beneath his power, a simple plaything to be tossed around by his every motion, practically just an extension of his body by this point. The feeling was mindless and incredible. Soon the pounding was too much, the stoked-up ball of fire inside her belly erupted and she began climaxing repeatedly and uncontrollably while he continued to carnally plunder her sopping sex. She howled as she rode out her ecstasy, and he growled as he rode her body to his own shuddering eruption, deep inside. The intensity of stimulation was such that, for several long seconds, she thought she'd gone blind; she simply could not process any other simultaneous sensation.
She thought she detected a slight shake in his grasp as he tugged undone the knot of his tie 'round her wrists, and then he pulled out, to leave her disheveled, shivering over the desk, holding herself up by her elbows now her knees were too weak to do the job unsupported. He made sounds of leaving; she turned, determined to breathe out a husky "That will be all"; he was already out of the door. It swung closed on the post-orgasmic heap of her body. She found herself grinning wide, and wondered when she would next feel the urge to summon him once more.