Note: This story was dynamically reformatted for online reading convenience.
 
 Well, Labor Day weekend finally arrived.  The weather was hot and steamy.
It was also the last weekend the pool would be open.  And there I was, with
Ron, at the pool in a bikini.  I was going to enjoy myself before the start
of my senior year on Tuesday.

   We had gone to the pool that Sunday, and then were going to his place
later in the afternoon.  I really wasn't sure I wanted to go, but his house
had air conditioning.  My parents' house did not.  His parents were also
away for the weekend.  Besides, the past two times I had been there the
Rottweiler had licked me, and was walking around with a fully exposed
erection whenever it saw me.  The one time it even jumped up on me in front
of Ron's parents.  His mom and dad didn't get upset; they just laughed and
called off the dog.  I was beginning to feel the dog definitely was
attracted to me.

   We left the pool around three, and I went home and took a shower and
changed.  Around four-thirty he picked me up and we went back to his house
and ordered a pizza.  The Rottweiler got one sniff of me, got an erection,
knocked me down and tried to lick me.  Ron laughed and led the dog out to
the deck.  We ordered a pizza for dinner and settled in to watch a bit of
TV.  We were going to take in a movie later.

   We finished off the pizza and Ron began to tease me a bit.  I was a
little surprised at this, because we weren't in a place where we could be
seen.  But I loved it when he played with me, so I didn't stop him.  In
about three minutes, he had me naked and was driving me crazy.  I had
forgotten all about the movie.

   Now, there is something you need to know about me at this point.  I
absolutely love being played with.  I can orgasm from a guy playing with
me. I find it heavenly.  I can also be talked into anything when I am
really aroused from finger play.  Indeed, I had given my first blowjob to
Ron after he made me climax with his fingers.  I had also done anal with
Ron.  If a guy gets me going, I will do just about anything.  What I didn't
expect was what I was going to do that afternoon.

   Well, Ron had teased me very slowly, and by the time I was close to a
climax my whole body was one very raw nerve.  He took a break.  I was
really out of it, crawling the walls, and didn't pay attention to what he
was doing.  He opened the patio door and let the dog in.  Then Ron sat
beside me and went back to his finger play.

   He was pinching and tugging on my nipples when the dog barked and
started licking my mound.  I opened my eyes, looked down, and gasped.  I
tried to stand up but I was pretty wobbly.  The Rottweiler backed off,
growled, and then jumped on me and knocked me to the floor.  I went down on
my back.  My nipples were pretty tender; because when the dog knocked me
down they got yanked out of Ron's fingers.

   I was on my back, with my legs spread, trying to squirm away.  The dog
barked once and buried his nose in my mound.  I went through the ceiling
when it started using its tongue.

   I was shaking all over and was still pretty weak.  I tried to pull away,
and rolled to my stomach.  I tried to get away.  I heard a low and mean
growl come from the Rottweiler, and he pushed his nose right up against my
anus.  I was scared, and I was still pretty shaky from Ron's previous
attentions.

   "Baby," said Ron softly, as he knelt beside me and started playing with
my nipples again, "just relax.  Get up on all fours and just relax.  It
will be fine."

   I was scared of the dog.  I really was.  I got on all fours, the
Rottweiler went back to licking, and I re-entered heaven.  The dog licked
me for a few minutes and then started to mount me.  He got on top of me and
started thrusting, but all his penis did was rub in my butt crack.

   After about three hard thrusts, the penis found its mark.  The dog
entered me hard and fast, and it hurt.  I could feel its rough member,
spouting precum, inside of me.  The dog shortened its thrusts, but kept up
the speed.  And I loved it.  It was heaven!

   I really don't know how long the magnificent Rottweiler used me.  I know
that I loved the feeling of that oddly shaped cock inside of me.  It was
generating the most marvelous sensations!  I rocked with the dog.  Ron told
me after it was finished that the dog had used me for about twelve minutes.
The dog gave a very hard final thrust, and then came.

   The Rottweiler jerked a few times as it emptied its semen inside of me.
I shivered, and then I cried out.  The dog pushed again, and I thought I
would break in two when it entered me with its knot.  The pain and pleasure
was exquisite.

   Once the knot was inside of me, I felt the Rottweiler empty more semen
into me, and then it relaxed.  The dog held itself inside of me for a few
minutes while Ron kept playing with my sore and tender nipples.  Then it
tried to pull out, dragging me part way across the floor.

   "Relax, Baby," Ron whispered in my ear.  "Relax, and speak softly to
Thor."

   Thor was the dog's name.  I relaxed, and spoke softly to the Rottweiler.
The knot shrank, and the dog pulled away.  Ron led it back outside to the
patio, where it sat down and cleaned its still hard member until the penis
shrank.

   I was out of my mind with a wonderful afterglow.  I rolled over to my
back, and laid there with my knees bent and legs spread, one hand on my
stomach and another behind my head.  I was in heaven.

   Ron told me that I was divine.  He also told me in the future it would
be a good idea to help guide Thor inside of me.  Well, all I could think of
was how magnificent Thor was.

   Ron and I stopped having regular sex after that.  Oh, he still played
with me, and I gave him blowjobs.  But the only penis I wanted inside of me
was the one attached to a canine.  I don't think that Ron wanted to fuck me
after I did his Rottweiler.  And I didn't care.

   We continued to date until just after Christmas.  I serviced Thor
throughout that time.  When we broke up, in January, I would remain
sexually inactive until the summer between my freshman and sophomore years
in college.  The bottom line was that I was in love with canines, and
really didn't want a human penis anymore.  And, after a slow start, I would
become a bitch slut.