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 She eyed me with what looks like almost sympathy and whispered "the rules
are the rules".

   I eased my self off her and loosened her wrists and she slipped free
indicating that it was time for me to replace her on the bed.

   As I lay I felt her warmth and sweet scent on the sheets, and as she
leant across to tie my left wrist, she pressed against my cock either
deliberately or accidentally.

   She took my right hand in her left, and I suddenly felt the other
stocking and her firm hand slowly and methodically rub the length of my
shaft.

   The sheer, satin touch sliding up and down started to drive my wild and
for a split second, I felt that suddenly tightening in my balls that means
I'm about to blow my load.

   After a few moments, she slipped the stocking over my right wrist and
pulled it slightly tighter, so like her, I could easily escape if I needed
to, but that was the last thing on my mind!

   I really expected her to use up a fair share of her twenty minutes
before we actually got to fucking, but as soon as I was tied, she straddled
me, and lifted my cock so she could rub her wet lips with it.  Then she
lifted, guiding my tip to her swollen opening.

   For a few seconds, she seemed uncertain, starting to slide down on me,
but then pulling away as if she didn't want to.  The anticipation was
driving me crazy and I moaned with relief and she finally sank down with my
cock meeting not the slightest resistance as I slid deep inside her.

   As soon as she had me inside her, she started to thrust frantically and
I wondered whether it was for her orgasm or whether she wanted me spent as
quickly as possible, After a couple of minutes, I couldn't hold any longer
and I shot what seemed like every drop of cum I've ever had inside her.

   I collapsed back on the bed almost exhausted, thinking that's the end of
the most amazing sex I've ever had.  We rested for few minutes, she still
straddling me, my deflated cock still inside her, and imagining I can feel
my cum dripping down from deep inside her.

   She glanced at the alarm which I couldn't see, and the same slight smile
appeared as she lifted up and off me.

   Before I knew it, she again straddled me, this time with her knees up
against my armpits.  She lifted herself slightly so her glistening cunt was
only about two inches from my face and I could see every glistening bead of
moisture and her delicate, wet pubic hairs sticking to her skin.

   Slowly she slid her right hand to the lips of her sex, parted them and
started to rhythmically rub around her clit with the second and third
finger.  I could see the opening of the swollen slit stretching slightly
apart and my cum starting to seep out of her.

   She felt it too and slid her two fingers deep inside herself.  After a
few seconds movement, she extracted them and pressed them into my mouth,
forcing my lips apart, and her cum soaked fingers into my mouth.

   Still holding my lips apart, she lifted herself slightly higher and
forward so her leaking slit is over my mouth and I started to taste the
salty cum dripping from her into my mouth.

   She's now rubbing frantically and I knew that that massive orgasm for
which she was yearning was close, She was moaning loudly and suddenly let
herself drop onto my, her juicy snatch almost suffocating me as it
contracted almost violently as she exploded into orgasm and I could almost
feel the warm waves of relief flowing out of her

   After a few moments and still panting, she lifted off me and turned in
the other direction, 69 style and started to lean forward My cock was
semi-hard again in an impossibly short space of time and I was waiting for
the feel of her tongue teasing me before she took me into her mouth.

   But she stopped just short, and bent forward slightly until I could just
feel the fringe of her short hair brushing lightly across my prick as she
flicked her head from side to side

   Her hand slid back between her legs and I knew she was going to bring
herself off again.  Her fingers were still moist from the mixture of juice
and cum, and she slid them slowly between her lips.  I was thinking she
wanted them back inside her slit, but she slowly rubbed them up and down
almost as it she wanted to collect as much lubrication as she could.

   Before I know it, her forefinger moved further back and was rubbing
around the rim of the lovely taut arsehole just a few inches from my eyes,
slowly moistening it, until her finger slowly disappeared up the tight
ring, penetrating deeper and deeper.  Only seconds passed and she was
thrusting it in faster and deeper as she leant forward and started flicking
the tip of my cock with her tongue.

   Suddenly she extracted her finger and leant across and over to her
handbag alongside the bed.  I could hear something being opened, but
couldn't tell what it was until she straightened up and I felt smooth, cool
sensation of a lubricating jelly being rubbed up and down my shaft.

   She moved further until I felt her wet pubic hair rubbing against me. 
Leaning further forward, she lifted herself and eased my cock back until it
was caressing and teasing the rim of her now slightly swollen arsehole.

   I almost swooned as I knew what was coming next ...  she slowly, but
deliberately lowered herself and I felt myself sliding smoothly into that
tight, forbidden anal passage.

   She rocked backwards and forwards faster and faster, trying to drive me
further and further up into her.  Even from behind, I could see she was
masturbating frantically and it took about 60 seconds before I exploded
inside her again

   I lay back almost unable to move and with no idea of how far we are
through her twenty minutes.  I felt her body roll off me and my totally
depleted penis pushed gently out of her.  She slipped off the bed, and as I
lifted one eye, I saw her pick up her ruined panties and wipe herself dry
with them.

   I suggested she untie me, but she just looked at the clock and said
"still got four minutes left"

   She rearranged and clasped her flimsy bra, slipped her dress back on and
turned to the door..  With that same shy smile, she tossed the wet panties
on my face and whispered softly "you can keep the stockings too"

   I was nearly too exhausted to move but I started to position myself to
slip out of the loose bonds.  But as I do, her voice echoed back to me "the
rules are the rules" and I collapsed back until the alarm sounded a few
minutes later.

   I carried those stockings from then until today when I again bumped into
her leaving the office, this time just outside the office.  Reaching for
them in my inner jacket pocket, I smiled at her and asked quietly "will you
miss your train again?"

   That enigmatic smile crossed her lovely face as she said "oh, I never
catch the train, I drive to work everyday"