My Girlfriend and Her BFF

In my senior year of high school I had a hot girlfriend.  We never had intercourse but used to mess around.  One reason I liked her is that she had an awesome set of pert tits with nice long nipples that I liked to play with and suck whenever I could.  Her nipples were always erect and showing through her shirts, since she wore bras made of thin material or often went bra-less, causing my cock to get hard in my pants. Her best friend, who was also in our circle of friends, was somewhat nerdy, but had bigger tits with awesome nipples that were hard not to notice. One time it was just the three of us at my girlfriend's house and somehow we got into a joking discussion during which my girlfriend said how obvious it was when a guy popped a boner in his pants.  I said to them it was just as easy to see when girls were excited because their nipples would pop out through their blouses.  They both said it wasn't true and guys would show their excitement before girls. I don't know how it got started, but my girlfriend said she could prove it.  The three of sat on the sofa in her family room, I was in the middle of the two of them, and she said let's see who shows excitement first. With that, she put my arm around her so that my hand was right on her left breast.  She then began to lightly rub my cock through my pants and I began to lightly brush against her nipple.  In the meantime, her girlfriend was staring at my crotch to see what was going to happen.  I really don't know which happened first, but in no time my cock was tenting in my pants and both of my girlfriend's nipples were poking out. Without warning, her girlfriend reached down and put her hand on my bulge and began stroking my cock through my pants.  Whereas my girlfriend had just been lightly brushing my cock through my pants, now that my cock was hard and sticking up, the horny best friend was grabbing/rubbing my dick with a little more intensity.  I looked over and her big nipples were already sticking out without any touching at all.  I put my other arm around her and began to squeeze one of her tits and pinch one of her nipples.  So there I sat with two girls playing with my cock while I played with their nipples and tits.  It was fun and arousing even though we were fully clothed. If we had been alone, at that point, my girlfriend would have unzipped my pants to play with my dick.  At first she didn't seem to mind what was happening between me and her best friend, but stopped short of pulling out my cock.  After a few minutes of this, my girlfriend jumped up and said, "let's get something to drink", which I think was her way of ending it.  Just as she turned her back to walk toward the kitchen I reached over and took a few final squeezes of her friend's nice tits all the while her hand was still on my cock.  Then she got up, followed by me after adjusting myself so that my still erect cock didn't show much.  I quickly sat down at the kitchen table so they couldn't see my crotch, and we got our drinks and started another conversation, not ever saying who was proven correct. Nothing more was ever said about it.  We graduated and all went away to colleges in different cities.  My girlfriend and I broke up during that first year. During the following summer I went to a party at a friend's house.  As was sometimes the case, the lights were down low and couples were making out all over the place.  I was there unattached and it turns out my old girlfriend's best friend was there also.  We talked for a little while and ended up in a dark corner.  We were sitting facing each other on the floor.  I leaned over and we began kissing.  I was dying to feel her wonderful tits again, so reached up and began to touch her through her blouse.  Since it was dark, I think she felt bold, so she reached out and once again began to rub my cock (which was already rock hard) through my pants, but this time she unzipped my fly and pulled it out.  I unbuttoned her blouse and just lifted her bra up over her tits. We sat there for a few minutes, playing with each other in the dark with other people close by.  I loved the feel of her firm tits and erect nipples and the feeling of her hands all over my cock, flesh to flesh.  Since we obviously couldn't go on like this where we were and didn't have a place to go, we both adjusted our clothes back the way they should be and nothing happened that night. Although I never had sex with my girlfriend in high school, her best friend and I continued to lust after each other, making out and petting whenever we could.  We eventually clandestinely slept together a few times, finally totally exploring and enjoying each other's hot, young, naked, bodies.  I also used to fantasize about her when I was alone, and jacked off many times thinking about her sexy body and how good it felt when we had sex.