Christopher did as he was told, his heart pounding as he waited for his master's hard body.

It was almost a ritual by now. David kneeled between Christopher's thighs, slowly rubbing the hairless, bare skin of his nullo's crotch. Just touching the thin scar instantly gave David an erection.

Christopher could feel David's wet finger gently rubbing the outside of his anus. The puckered brown hole opened easily as first one, then two fingers slipped inside. He groaned as David gradually loosened his ass muscles.

Now David was on top of his nullo, his 220-pound frame pinning the boyish, lean body to the mattress. His hands gripped Christopher's shoulders, holding him in place. Christopher panted as he awaited the feel of his master's cock plunging into him. He didn't have to wait long.

The next 15 minutes were a frenzy of sweaty, grunting passion. David pounded Christopher's smaller body like a hammer, driving his cock into him over and over again. Christopher squealed with each thrust, loving the feeling and the sheer joy of submission. The only time he felt more excited was the day David had him nullified.

Christopher met David online in a Top/Bottom website. What instantly caught Christopher's eye was David's posting:

"Looking for LTR with submissive man who lives to be fucked. Me: 6'3, 210 lbs, 49yo, hairy. You: 5'8" or less, 140 lbs. or less, smooth. I want to pierce you, tattoo you, and modify you."

That last sentence immediately made Christopher hard. What did it mean by modify? Did it include castration and penectomy? Or even more? The idea made his pulse pound. He had long fantasized about giving himself over to a strong dominant man who would nullify him and keep him as a sex toy.

When they arranged a meeting, both knew they had found what they were looking for. David liked Christopher's thin, smooth body, short brown hair and blue eyes. He also liked Christopher's submissive personality; the boy rarely made eye contact with him.

For Christopher, David was the embodiment of all his fantasies. He loved looking at his strong hard body, his muscles rippling beneath a tight t-shirt. David was a good 7 inches taller than him, and judging from the bulge in David's jeans there was at least another 7 inches between his legs.

They met for coffee, but didn't stay long. "Let's go back to my place," David said, tossing a few dollars on the table. It wasn't a request; Christopher knew that David already had taken charge of his life.

That first time in David's condo was beyond all Christopher's dreams. He was ordered to strip as soon as they stepped into the apartment, and then David pushed him down onto his knees and shoved his huge cock in his face.

Christopher choked on David's massive tool, but David held his hands in back of Christopher's head, forcing him take the long shaft deep into his throat. It took awhile to get into a rhythm, but soon Christopher was sucking away, listening to David's moans as he crept closer to orgasm.

"That's enough!" David said gruffly, pushing Christopher's head away from his crotch.

In a flash, Christopher was bent over the bed, his legs spread wide apart. David spit on his cock and began pressing it against Christopher's hole. The huge size of the head made Christopher gasp in pain.

"Shut up!" David said, slapping Christopher's ass hard. He held Christopher's hips tightly in his hands as his cock continued pushing inside Christopher's tight ass.

It hurt, but it felt wonderful. Christopher loved being dominated by this powerful, gorgeous man. He loved the feel of the huge cock deep inside him, the feel of David's arm across his chest, holding him tight. The feel of David's bristly beard rubbing against his bare back.

Christopher's cock was rigid, and he began jerking it frantically. But David wrapped his hand around Christopher's ballsack and squeezed hard, sending a sharp jolt of pain into his body. Christopher screamed, and his cock wilted.

"Never touch that in my presence!" David said, holding Christopher's face in his hand. "Do you understand?"

"Yes...yes I understand," Christopher said weakly.

"Good!" David grinned, resuming his raw fucking of Christopher's ass. With a loud grunt, he spewed his cum deep into Christopher's bowels.

As David relaxed on the bed, Christopher went into the bathroom and jerked off, thinking about the hot fucking he just had. But he wanted to know why David didn't want him touching his own dick around him.

"There's only one cock around here, and that's mine," he said as Christopher cuddled up with him. "I don't want to touch yours, and I don't want you touching yourself around me.

"I don't even want to see your cock," David continued. "Someday, I won't have to."

Christopher's heart skipped a beat. What did David mean by that? He thought about the original online message, and the word "modify". Did David really want to cut off his cock?

Things slipped into a pattern after that. David saw Christopher as his bottom, and Christopher loved it. He spent hours sucking David's cock, and bent over the sofa while David fucked him hard. Christopher could feel his own cock dripping pre-cum as David plowed his ass, but he never touched his dick while David was around.

Even when they weren't having sex, David tended to dominate their relationship. He expected Christopher to do almost all the chores around the house, and to always stay naked while at home, except for a jockstrap that covered his cock and balls.

David took Christopher to a tattoo/piercing parlor one evening, and for the next several hours he put his mark on Christopher. First, his nipples were pierced with gold rings. Then came a tattoo across his lower back: David's Bitch.

Finally, a small brand was seared into his left buttock: a capital D. The pain was intense, and the smell of his burning flesh was sickening. But the next day Christopher was proud to see his lover's initial burned on his ass

After a few weeks together, David told Christopher he wanted him to move in with him, and Christopher happily agreed. Shortly after that, David said it didn't make sense for Christopher to keep his job, since David made plenty of money. That way Christopher would have more time to take care of the chores. Once again, Christopher agreed.

Now, Christopher was completely dependent on David. But strangely, he didn't resent being dominated by his lover. Just the opposite. It gave him a feeling of security, knowing that his man would take care of him.

The same was true with sex. Christopher loved the feeling of David lying on top of him with his full weight, pinning Christopher to the bed. He moaned loudly as David's cock slipped in and out of his hole, while David bit his neck and ear. Best of all, he loved hearing David grunting as his cum shot into Christopher's ass. He tightened the muscles in his anus, milking every drop from David's huge prick.

Still, he couldn't help thinking about David's attitude toward Christopher's own sexuality. It wasn't just that he didn't want to touch or even see Christopher's cock - David actually seemed annoyed that Christopher even HAD a cock!

Then one day, while David was away at work, Christopher was surfing the Internet on David's computer. He noticed that Christopher had forgotten to close his mailbox, so he began reading through David's email.

It was the shock of his life - David had been corresponding with cutters, men who cut off the cocks and balls of other men!

"So do you want your boyfriend to lose everything?" asked one respondent named Mike.

"Yeah, the whole package," David wrote back. "I'm so sick of looking at those things dangling between his legs. I want him smooth, not even a pisshole down there. You can make him a new one down near his asshole."

Christopher sat in front of the computer, his mouth opened in disbelief. David was actually planning to nullify him! But along with the shock, Christopher noticed another emotion - excitement. His cock was straining to get out of his jockstrap.

He yanked off the jockstrap and began jerking his cock, which was already dripping. Christopher kept reading the last e-mail over and over again, getting more excited at the idea of being nullified. In just a few minutes, his cum spurted up to his chest and slowly dribbled down his stomach.

Afterwards, he began thinking about why the idea of nullification was so exciting. He decided that it all came down to his submissive nature. He loved being dominated by David, and giving up his cock and balls would be the ultimate submissive act. Besides, it would strengthen his relationship with David, who he was in love with.

He knew that he'd miss the feeling of shooting his sperm, but it was a small price to pay for his new life.

Christopher stood before the full-length mirror, tucking his cock and balls between his thighs. The image made him grin - this is what he wanted to look at for real. With all his heart, Christopher wanted to become a nullo.

When David came home that night, Christopher was ready to tell him the news. After they finished dinner, Christopher sat him down on the sofa and asked, "Remember in your personal ad, you said you were looking for somebody to modify?"

David looked a little surprised by this question. "Sure, why?"

"Well, you pierced me, tattooed me, and branded me," Christopher said, smiling. "Is that the end of the modifications?"

David didn't know what to say. "Well...I don't know. I'm not sure. I guess we could go a little further..."

Christopher grinned and kissed David on the lips.

"I want to go further - much further," Christopher said excitedly. "I want to go all the way!"

David's mouth dropped open. "You mean..."

"Yes! I want you to nullify me. I want you to take away my cock and balls. As soon as possible!"

David hugged Christopher tight and kissed him passionately. David's hard cock pressed against Christopher's body through his shorts. In a few seconds, both were naked and Christopher was bent over the sofa, with David probing his asshole with a wet finger.

It was the hottest sex of their lives. David's cock was never so big and hard, and Christopher screamed with pleasure at each thrust into his rectum. Without even touching himself, Christopher's cock spurted jism all over the sofa. David followed a a few moments later, blasting his load deep into Christopher's ass.

David wasted no time in fullfilling Christopher's wish. He arranged to have a doctor friend come by and perform the surgery the following weekend.

On Saturday night, their bedroom had been turned into an operating room. David helped Christopher up onto the table, his legs placed into stirrups, spread wide.

While David shaved Christopher's crotch, the doctor inserted an IV line into a vein in his right arm. Christopher began feeling light-headed as the mild sedative began flowing through his body.

"We'll start with a drug that will take the edge off the pain, but you'll still be very alert," David said, rubbing his fingers over Christopher's now-smooth belly.

Christopher's heart pounded as the moment of his nullification drew nearer. He felt his cock stiffen, which made David and the doctor both smile. "Can't wait, eh?" grinned David.

"Guess not," laughed Christopher.

He watched as David picked up a silver-handled instrument in which a small green band had been placed at the tip. By squeezing the handles, the band expanded into a square-shaped opening.

"I wanted to be the one who castrated you, Chris," said David, gently stroking Christopher's head. "I'm going to put this band around your balls. It's going to hurt, but the drug should make it bearable. Okay?"

Christopher nodded his head, filled with a mixture of fear and excitement. His cock was throbbing now as David slipped the green band over his sack and began ratcheting down the elastrator.

The sensation of having his balls squeezed tightly was thrilling, despite the dull pain that began radiating into his crotch. David placed the empty elastrator on the table and held Christopher's captive sack in his hand, watching as it turned a dark red.

Then David did something he never did before. With his other hand, he began to gently stroke Christopher's hard cock. The sensation was so exciting that Christopher forgot about the pain.

Using his thumb, David spread Christopher's pre-cum over the head of the cock. Christopher's cock was putting out a lot of the clear fluid now as the pleasure and pain both grew in intensity.

David stroked the cock very gently, careful not to trigger Christopher's orgasm too quickly. The sack was now turning purple from the lack of blood. Christopher began thrusting his hips, trying to increase the friction with David's hand. But his lover relaxed his grip, prolonging the dance.

A half hour had now passed since Christopher's balls began dying. He was in a frenzy, desperate to cum and to end the pain that was strangling his balls. But David patiently ran his fingers over the hard shaft, tracing every vein, tickling the underside of the oozing head. He was determined to prolong the experience until the point of no return, when Christopher's balls would be dead and he'd begin life as a eunuch.

"Please let me cum," Christopher whimpered, his body trembling. David smiled and lowered his head to Christopher's cock, his tongue licking the glistening tip for a moment, before his mouth swallowed the penis down to its root.

"Oh God," Christopher moaned.

Christopher's hips lifted off the table and his back arched as hot creamy cum filled David's mouth. Knowing that this would be his lover's last ejaculation ever, David nursed the cock, sucking every drop from Christopher's rod. He didn't let the organ drop back onto Christopher's stomach until it had softened and shrunk, and Christopher's breathing has slowed almost to normal.

"It's time for some stronger medicine," the doctor said, injecting a hypodermic into the IV line. Christopher entered into a dreamlike state, neither awake nor asleep. He couldn't move a muscle in his body, and the pain faded from his groin.

He saw David putting a knife to his sack, and then holding his balls up high with a grin on his face. The heavy scrotum dropped into the silver pan and Christopher stared at his lost manhood with drug-induced indifference.

The penectomy took hours, but in his state of semi-consiousness Christopher could not tell that much time had passed. He vaguely sensed that the doctor had slipped a catheter down his cock and then sliced his cock into long strips that were dropped into the silver pan alongside his balls. He could see David watching intensely as the doctor dug deeply into his groin, cutting away all traces of his penis before sewing the wound closed.

Christopher felt the doctor probing near his anus, using a scalpel to open a small hole that would be his pisshole from now on.

Then came a curious sight - the doctor picked up a portable handsaw and began cutting away the flesh and bone below his right knee. It seemed like no time at all had passed before the lower part of his leg was detached and placed in a red plastic bag.

Something deep inside Christopher's brain told him to scream and protest this new assault on his body, but the drugs made him unable to act. His only outward response was the tears welling in his eyes as he became a legless amputee.

A new injection into the IV quickly put Christopher to sleep. Long hours passed before he awoke, this time in David's bed. David was gently kissing him as his eyes opened on his new reality.

White bandages covered both leg stumps and his empty crotch. The IV still was in his arm, dripping morphine into his ravaged body. Christopher began weeping.

"That's okay, Chris," said David, holding his lover closely. "Let it all out. You've had a pretty rough day."

"Why did you take my legs? You never said anything about them!" sobbed Christopher.

"No, I didn't. But when I said modify, I meant more than just your cock and balls. To be a true submissive, you had to give up your freedom of movement as well.

"I had the doctor cut off your legs is a special way," David said. "It's almost impossible to attach artificial limbs to your stumps. I don't want you to think that will ever be an option."

Christopher wept for hours that day. He had lost so much. But in the weeks and months ahead, he learned how much he had gained, too.

It didn't take long for Christopher to learn how to maneuver himself, using his hands for propulsion across the floor. Without his legs, Christopher's body was much lighter and easier to move around.

When the two men went outside, Christopher took a special pride as David scooped him into his arms and placed him in the wheelchair. They got admiring glances in town as David wheeled him around, two handsome men, one crippled and one not.

Above all, the sex was great. David fucked him in every conceivable position around the house. He loved kissing Christopher's bare crotch, licking the scar left behind. And Christopher adored the feeling of David's heavy body crushing him into the mattress or the carpet, his stiff cock buried deep inside him.

And after each sweaty session, Christopher would kiss David gently and smile.

"Thank you," he whispered in David's ear.