“Right,” she said, “Let’s get this over with.”

Grasping his manhood in a business-like manner, she began a steady pumping action,
increasing in speed rapidly until his body bucked with the muscle spasms of one of the
most intense orgasms he had ever experienced.

She cleaned him with the cloth then wiped him down with the cold flannel.  Its coldness
quickly subdued any remaining firmness.

Rapidly, she pulled something he could not see over the top of his shrunken manhood.  It
felt cold over and around him, and it tightened and restricted him.  She pulled,
tightening straps around it and under his testicles, pulling them until there was a sharp
click, at which she immediately climbed from him.

“That should keep you under control,” she said.

He saw the restrainer with the padlocked straps, now attached firmly.  A series of metal
rings linked by small but tough leather straps encased his cock securely, becoming smaller
towards the end.  The tightness of the rings meant there was no way he could possibly
become even partially erect, and the strength and tightness of the locked straps made it
completely impossible to remove, even if his hands had been free to try.

He started to protest, but she interrupted him.

“We need to stop the girls taking advantage of you without MY permission,” she told him. 
“That should sort it out nicely.”

“And,” she continued, “Don’t think of trying to get one of my girls to release you from
this bed out of some misplaced sense of sympathy.  Each of those straps is secured with
two locks, and no girl will ever have both the keys.  It will need two of them to make the
decision to free you, and believe me I choose the keyholders VERY carefully.”

“Now,” said the headmistress, ”I think we ought to make a start.  We have delayed too
long, and there is much for you to do.”

Despite her earlier hints of what might be to come, he still had no idea what she meant. 
He opened his mouth to protest once again and to seek some sort of explanation, realising
as he did that she had removed her leather skirt completely.

She climbed back onto the bed to straddle he chest once more, facing towards his head
this time.  He could not avoid looking at her.  Although she was certainly no youngster
her body was smooth and firm, and he was staring straight between her naked legs. 
Instantly felt the tightening inside the restrainer, the smooth metal rings preventing any
enlargement and holding him firmly within them.  The pressure increased, and he squirmed
slightly in frustration and discomfort.

She slapped him across the face, not too hard but with enough force to sting his cheek.

“Silly boy,” she said, “It’s not hurting you.  Think yourself lucky I used one that’s
designed just to restrain you, not to punish you.  Some of my others have small spikes on
the inside of the rings – or perhaps you would actually prefer one of those?”

He shook his head vigorously.

She laughed.  “We shall see,” she said.  “We shall see.”

Without waiting for a reply, she moved up the bed until she was kneeling directly over
his face, just touching him.

“Lick me,” she commanded.

He did as she ordered.

“Deeper,” she said, and pushed herself down onto his mouth, as his tongue licked and
probed inside her.  She became wetter and wetter as he licked and tasted her juices.  She
started to push down onto him rhythmically, and he pulled his face back a little to avoid
the discomfort.

“No!” she shouted.  “I knew you’d need training before I used you for the girls.”

She looked down at him for a few moments, as it considering the best action.  “You will
learn that disobedience means punishment,” she said seriously, and brought her knees
together suddenly and forcefully.

She pressed herself down to completely cover his face.  He was in complete darkness under
her, and scarcely able to breathe.  He wriggled frantically, trying to find a gap and to
suck at the fresh air, but she merely pressed even harder onto him and slid slightly
forward so that his nose went up inside her.  His mouth was totally covered by her firm
flesh and unable to draw in any air at all.  Trying to breathe through his nose was not
unlike trying to breathe underwater.  He struggled to move just enough to catch a breath
of air, but her legs and body held his head tightly.  He was smothered totally.

Seconds passed as he strained to move and to breathe.  Finally, he gave up trying.  It
was hopeless, and he knew he was trapped and airless until she decided to release him. 
His fight and his panic only sapped his strength and used up what little oxygen remained
in his body.  He lay still, his thoughts becoming hazier while his body screamed
hopelessly for air.

At last, she released the pressure and he was able to gulp a few breaths of much-needed
air.

“You see? “ she said.  “Behave and all is well.  Defy me, and you suffer.  “We’ll try
that again.  Don’t move.”

Once again, her knees came together and covered him beneath her in total darkness.  His
nose went deep inside her, and his mouth was covered again.  Knowing that now he had not
even the smallest reserves of air in his body it would only be seconds before he lost
consciousness.  He lay completely motionless, too afraid to move, and this time it was
only a few seconds before she released him.

“There you are,” she said, “You were a good boy, and your reward is that you can breathe
again.  I may remind you of that from time to time.  Now, continue.”

He was licking again as she writhed above him.  He had no idea how long this went on, but
it seemed like hours.  

Then “Suck,” she commanded, and he was sucking at her as she pushed herself at his face.

“Stop,” she said suddenly.  “That’s not good enough.  I shall have to do it myself, and
you shall help.”

“In fact,” she went on, “We shall play a game.  I shall be covering your mouth and nose,
as before, while I attempt to reach a climax.  You will assist me towards my orgasm as
rapidly as possible with your mouth and nose.  I shall release you from this as soon as I
have achieved a satisfactory climax.  Your reward for assisting efficiently will be that
you will then be able to breathe easily again.  If, however, you are not efficient in
doing this, then...”

She did not finish the sentence, but immediately pressed down onto him and brought both
her hands down to massage herself with her long fingers.  Although her knees remained
apart and it was nothing like the claustrophobic sensations of his previous punishment,
the pressure on his mouth and nose as she pushed and writhed meant that he was only able
to catch brief breaths of air between long periods of being completely covered and
smothered.  He would not be able to take much of this without losing consciousness.

He licked.  He sucked.  He pushed his tongue, his nose, his whole face into every part of
her he hoped gave her pleasure.  Her body squirmed and writhed above him, her fingers
working on her body to produce the climax she sought as he desperately did everything he
possibly could to speed that climax.