The following story is a reply to _andread_'s post, with the mspaint pics at enZ's request.

Teri was 14 when I met her.  It was late in my junior year in High
School and she was the best friend of Sheila, a girl I had wanted to ask
out.  They were both in the 9th grade and played clarinet in the band.  For
a few weeks, we three hung out together and through that, I got to know
Teri pretty well.  She was the oldest of three sisters in a very
conservative Catholic family. She was pretty, fun, and intelligent and
seemed to be a typical "good girl".  I considered her a close
friend, but nothing more.

One afternoon that summer, we were going to a water park near my house.  I
picked them up at Sheila's house and drove to the park.  After we paid
our admission, we went to the locker area to secure our shoes, towels and
shirts.  We stripped down to our swimsuits and I admired Sheila's
curvaceous figure as she peeled her shirt over her head. But when Teri
lifted her oversized T-shirt to reveal her red and white string bikini, I
got an instant hard-on.  Sheila had a nice body and her conservative
one-piece swimsuit accented her nice tits and ass.  But Teri had kept her
figure hidden pretty well until then.  She had ample 36C tits, a 24-inch
waist, and 36-inch hips with a killer ass.  She was slightly taller than me
and had the most beautiful eyes I had ever seen.  It was like I had never
looked at her before that moment.  She was the most desirable girl I had
ever seen. 

Later that day, Sheila was too scared to go on one of the bigger water
slides with me, so Teri volunteered to share a mat with me for the ride.  I
sat down behind her and put my arms around her waist as we began the wild
ride to the bottom.  She leaned back against me and I was sure she could
feel the erection her tits had caused pressing into the crack of her soft
ass.  Through the twists and turns, I held her close to me and she gripped
my hands about her stomach.  Toward the bottom of the tube, there were a
few tight turns and we lost control of our little mat, sending us sprawling
as we continued to plummet toward the catch pool below.  I reached out to
try to help Teri right herself and found my hands full of tits.  I had
reached around her to try to pull her back to me and had found only mounds
of wet titflesh, thinly covered by her bikini top.

Suddenly, there was a flash of sunlight and we were tossed into the
catch pool at the base of the slide.  Under water, as I touched bottom and
prepared to propel myself to the surface, I felt Teri's hand lightly
brush and tentatively squeeze my groin, causing a jolt of instant
electricity through my whole body.  At the surface, she grinned at me as we
swam to the edge of the pool and I searched her beautiful blue eyes for a
hint of recognition as I helped her out of the water.  She simply smiled
and we met Sheila at the gate to continue to the next ride.  The day
continued with any further incidents, but it was clear that Teri and I
shared something.  

Later that night, Sheila called me and thanked me for the fun afternoon. 
She admitted that she liked me, but she thought Teri liked me more and she
really wanted to see us get together.  It was the typical "Ask him if
he likes me…" adolescent conversation, but as I hung up, I was
ecstatic.  I had known Teri for almost the whole school year, but she had
never seemed to me the type of girl I would ever date. But now, as I
thought about her body and what had transpired between us on the slide that
day, I had all sorts of ideas and fantasies about her.  In the shower that
night, pictures of Teri's amazing body and her gorgeous face filled my
thoughts as I jacked off to a very big orgasm.

I knew then, I had to have her.

Weeks passed and school started again.  All sorts of activities filled my
time, but Teri filled my thoughts.  She was two years behind me, so the
only class we had together was band.  We talked often on the phone and
spent a lot of time together after school and after football games.  One
evening at the pizza parlor after a game, I asked Teri to step outside with
me for a minute.  Nervously, I asked her to be my steady girlfriend.  She
giggled shyly and said "Yes!" with a big smile.  We kissed
hesitantly and gazed into each other's eyes.  I saw nothing but
adoration and innocent trust in her face.  I embraced her firmly and kissed
her again, this time sliding my tongue along her soft lips.  Her lips
parted and her sweet tongue met mine and they darted about our mouths, as
if dancing along our teeth.  She opened her mouth slightly, allowing me to
thrust my tongue into her mouth.  Her tongue welcomed mine and I could feel
her breasts pressing against my chest and hear her moan softly as our
bodies and tongues intertwined.  My cock was swelling inside my jeans and I
pressed my erection against her thigh.  Teri swayed her hips slightly,
further stimulating my throbbing member while her tongue wormed its way
into my mouth aggressively.  Our breaths were coming in ragged gasps and I
strained not to cum in my pants right there.  We parted lips and again swam
in each other's eyes.  It was our first kiss - and her first kiss
ever, I later found out.  We continued our oral exploration for a few
minutes, until people coming out of the pizza place interrupted us.  When
we went back inside, I caught Sheila's eye, and by the smile on my
face, she knew what had transpired.  She grinned broadly at me as Teri
rushed over to her to tell her what she had already guessed by the happy
look on both our faces.

For the next month, our time alone was spent kissing and holding each other
close.  We held hands in public and occasionally kissed, like typical
teens.  I wanted to share so much more physically with Teri, but I
respected her and wanted more than anything not to offend her.  She was
comfortable with me and never shied away from any of my affections.  She
never objected when I would caress her soft ass as we kissed or if I rested
my hand low on her hips when we walked together.  We both were careful
about our displays of affection around our parents, but when we were alone,
I never felt that Teri was uncomfortable about our physical relationship. 
So I decided to try to take it a step further.

It was our one-month "anniversary", and I had planned a romantic
candlelight dinner at my house.  My mom helped me cook a nice spaghetti
dinner and I served it with flair.  We drank sparkling grape juice from
wineglasses while listening to romantic music.  It was so perfect.  After
dinner, we sat in my living room and kissed for a while, as usual.  Slowly
and gently, I caressed her arms and side as our mouths melted into one
another.  Then I tentatively moved my hand toward her breast.  Teri moved
her arm, allowing me access to her soft globe and I cupped the underside of
her tit.  Her hand covered mine, pressing it into her breast firmly.  Our
kissing became even more fervent as I squeezed and kneaded the fullness of
her teenage titty. I could feel her erect nipple, even through the fabric
of her shirt and bra.  I softly pinched the hard nubbin, causing her to
moan into my mouth with desire.  My other hand had left her back and was
now exploring her other breast.  My kisses trailed down her neck as my
hands pressed her twin globes together and around, kneading and squeezing
them unashamedly as Teri whispered, "Oh, yes!" into my ear.   I
kissed her neck, being careful not to concentrate to long on one area,
since we were both afraid to find out how her Dad would react to a hickey. 
I nibbled along her jaw and down the graceful line of her neck, still
continuing my manipulation of her perfect tits.  My lips made their way to
the front of her neck and began making a trail toward her chest.  I felt
her hands leave the back of my neck and I watched as she unbuttoned the top
button on her shirt.  Without hesitation, I resumed my trek toward her
cleavage and reached up with one hand to pull aside her shirt to reveal the
lacy edge of her bra.  In the dim light, I could see the pale softness of
her breasts as they pushed out of the top of her bra, and I lavished kisses
on every inch of exposed titflesh.  We were both breathing heavily by now
and my mind was reeling, drunk with passion for the girl in my arms. 
Suddenly, I heard my mom walking through the house toward the living room,
and we were both jolted back to reality.  We sat up quickly and Teri
buttoned her shirt back up deftly.  Mom continued her walk through the
house, on to the kitchen, but Teri and I both knew it had been a close
call.  I turned the lights back up and we kissed a little more, as if to
cool down slowly or something.  Then I asked Teri if she was ready to go
home.  She looked at me quizzically and said she didn't have to be
home for another hour or so.  I winked at her and said I knew that, but
maybe we could stop somewhere on the way home…

I lived only a block from my old elementary school and the parking lot
of that school was secluded and not very well lit.  That was the place I
had in mind for a little more privacy.  When I pulled in there and killed
the lights and the engine, Teri smiled and scooted closer to me.  We
embraced and kissed passionately for a ling time, exploring each
other's mouths and necks until our breathing literally fogged up the
windows of my mom's car.  I slid my hand once again along her ribcage
toward her breasts and when it reached its goal, I was rewarded with a
contented sigh from Teri.  Again, I kneaded her firm tit until I felt her
nipple become erect and then I concentrated on it.  I tweaked and rubbed
her hard nubbin through her shirt and bra as Teri kissed my neck and moaned
lustfully.  My cock was begging for attention, but I didn't want to
come right out and ask my virgin girlfriend to jack me off, no matter how
comfortable she was with me.  So I suggested we climb over to the back
seat, so we could have more room. She agreed and I followed her over the
front bench seat in a tumble of hushed giggles and contented sighs.  We
settled comfortably with her on her back and me kneeling in the floor
beside her.  I leaned over to kiss her once again as my hand busied itself
with unbuttoning her shirt.  I fumbled with the top button a while until
Teri, without breaking the kiss, came to my rescue. She tugged her shirt
free of her jeans and deftly unbuttoned her shirt, leaving it to cover her
bra-clad breasts. I nibbled on her ears a little as my hand explored under
her shirt and just inside the edges of her bra.  Then I slowly made a trail
of kisses down her neck to her bare chest and opened her shirt to reveal
the satiny bra enclosing her magnificent tits.  I sat up and reveled in the
breathtaking sight before me.  Teri, clearly the most captivating girl I
had ever been this close to, was lying there in the pale glow of the
distant streetlight, with her shirt open to expose to me what no guy had
ever seen before. Her face was rapt, radiating a loving trust in me, yet
her eyes held a fire of lust and desire I could not ignore.  "You are
so beautiful!" I breathed.  Her smile in the semi-darkness said Thank
You, and I kissed her lightly on the lips, gazing into her eyes.  She put
her arms around my neck and pulled me to her.  I placed my knee in between
her legs and rolled over on top of her as we began to kiss deeply once
more.  My obvious erection pressed into the top of her thigh, and when she
began to move her leg against it, I began to thrust my hips.  Our tongues
played along each other's lips as I humped her thigh like a mongrel
mounting his bitch.  Even through my underwear and both of our jeans, I
could feel the heat of her leg on my cock.  I positioned myself once again
so my hand could continue wandering around the heavenly mounds of her tits,
this time delving deeper into her brassiere.  I gasped quietly as I felt
the warm flesh of her breasts for the first time. I gripped her tit firmly
as I ground my hard cock into her thigh, and I could tell from the way she
held me tighter, she was as hot as I was.  I sat up as she gently pushed me
aside.  Before I could ask what was wrong, Teri reached down and began
unfastening the clasp of her bra between her tits.  We looked deeply into
each other's eyes. I heard a slight "snap" and she drew in a
deep breath as she stretched upwards and placed her hands behind her head
in a most provocative way.  My gaze traveled downward to her now exposed
breasts and I must have gasped again, because Teri giggled coyly as I
stared down at the most beautiful sight I had ever beheld.  Her breasts
were truly perfect - full and firm, topped with the dark rosebuds of her
now-erect nipples and areolas.  I drew in a breath as I knelt once again at
the altar of her chest, this time burying my face in the velvety softness
between her tits.