Fingering the thin black cord around the base of my new shaft, I studied Tess as she had the man. Her upper half remained motionless above him except for her quivering lips, but the pounding of her hips relentlessly softened his ass for me. Unconsciously measuring myself against her, I felt contempt for her lack of strength and agility, and itched to show her up. Maybe I wanted to prove myself to Karen. I tested the snugness of the minimal rig around me and found it secure, reminded more than a little of an elaborate Japanese bondage knot. The audio output had dwindled to nothing as the doll concentrated on her pleasure.
"Both of these girls can fuck a man, though one lacks spirit, and the other ability," Karen said. "In you I see their drive and strength combined. There should be nothing stopping you." Tess reached her peak at that moment, simultaneously lunging forward and grinding her hips about once per second. She moaned with every hard thrust. "Our associate is obviously broken in, and he'll prove up to your challenge. Don't worry about hurting him." The light came on in the lab. After sliding out of her target, the subject sat at the edge of the bed and calmed herself for a minute. Then, she rose and exited the room. "Oh, and Jamie?" I turned my head to the tall woman as I waited at the inner passage. With a subdued whoosh the door slid open and the bulb went off. My fists swelled. "Have fun." At that, I smiled, and went in.
When the perimeter sealed automatically behind me I glanced at the spot where Karen was standing, and found the window was a mirror on my side. Another sweep of the chamber revealed the man patiently balancing on all fours and a bottle of lube on the nurse's table. I squeezed out some of the cold, clear gel and liberally coated my rod. Hesitating a moment, I planned my attack.
The first thing I did was reach out for his thighs and pull them to me. That caused his shins to slide off the bed, and he positioned his feet squarely on the floor. As quickly as he stood up I shoved his trunk back down with a firm hand on his neck, and he supported himself with his hands on the sheet, and his elbows up beside his shoulders. His legs moved apart in an unsuccessful attempt to steady his hips, which put him in exactly the pose that I wanted. I pointed the metallic dick at his sphincter and stood up on my toes to lean over him, letting my weight alone accomplish the invasion. When the cock was unceremoniously buried I fell gently on his back, and let my arms slink around his from below so that I was able to interlace my fingers in the hair at the base of his skull. Alarm and confusion stiffened his muscles, but there was no possibility of escape anymore.
"Down," I ordered, and he slid forward onto his forearms. We both dropped a couple inches, but I maintained my lock on his upper body and kept the phallus tightly planted within him. As if enjoying a swing set I sent my hips to and fro placidly to chart my range of movement. He must have wondered what was going on.
Slowly I unfurled myself atop him, and then clenched my thighs, buttocks, and abdomen as violently as I could. I settled into a relaxed state, and struck again. Then, I did it once more. It happened a fourth time. A series of vicious bucks brutally stabbed the man's ass. The action was so quick and precise it resembled a cartoon made from only two images. In, out, hard, soft, the force came mercilessly and regularly.
"Don't kill him, Jamie," Karen's voice pleaded over a loudspeaker. I felt the volunteer droop beneath me. After straightening up I placed my hands on his hips and plumbed him leisurely, a sneer marring my formerly impassive face. The crumbling resistance to the advancing dildo excited me, and I began another two-part sequence: the first had me bent over, gripping his hips at a distance; the second had my spine erect and his butt drawn to my crotch. Chewing on my lips, I focused on the flawless execution of the routine.
Though the plan had been to stop like a boy after I'd come, the ecstasy thrashing inside me couldn't deter my single-minded pursuit of total anal dominance. The locomotion continued for an hour, peppered by insults and slurs that I spat at my bitch.
"You like that! You fucking love it, don't you?"
"Yes!" he screamed.
"Take my fucking dick!"
My powerful slamming accelerated so that my sexy thighs were banging his, urging him closer and closer to shooting his own wad. He bellowed inarticulately and I went over the edge.
"Oh, God, yes!" I cried, and came for the final time that afternoon, in unison with the recipient of my aggression. In a fit of blind fury I pulled out of him and stuck my foot on his hip to push his helpless hide off the mattress. He dragged the twisted bedding with him, which in turn caught the end table and sent it on its side, causing bottles and metal instruments to clatter and scatter all over the floor. My fists out at my sides, I looked up at the ceiling and roared.
A week later, Karen called me.
"Wow, it's great to hear your voice," I said.
"It's nice to speak with you, too."
"I mean it, you've changed my life. Things are so much better since we met."
"Oh? How is your boyfriend handling this transformation?"
"Well, I guess you could call him my girlfriend, now." She laughed.
"Wonderful."
"It's funny, because I saw his mom wearing one of your t-shirts last night, and she asked me about his new passivity, as she called it. I burst out laughing. It turns out she's been fucking his dad in the ass for two months."
"It truly is a small world."
"Thanks, Karen. I owe you a lot."
"I'm glad I could help. And I'm thrilled to hear you're grateful, because I'm calling on behalf of the agency, Black Silk."
"Oh, yeah?"
"Indeed, a corporate magnate is one of their customers, and lately his tastes have been tending toward the exotic. They feel it's time to slip him a bonus. After reading the file, I thought instantly of you. Tell me, would you be interested in making the delivery?"
"Absolutely. Count me in, I'll be eager to help."
"Yes," she said. "I knew you would."
