Ahh, ahhhh, ahhhhhh! I tried stifling my voice as cum spurted out of my cock most of it missing the cup I had grabbed to catch my spunk.
Not exactly a great way to celebrate my 18th birthday. A bit of a mess to clean up I mused as I heard what sounded like a light tap on my door and seconds later Lisa, my step-sister, breezed into my room.
"Well, well, well," she giggled. "Is Jason having a little after-school solitary fun as usual," she enthused as I fought to stuff my dick back in my boxers and fumbled to change the image on my computer.
"Oh don't worry about covering yourself or the porn. I know what you do in here every day and Jenna and I have a proposition for your birthday," she informed me in a more serious tone.
(I should give you a little background information so you understand how what ensued from that point would dramatically change my life - for the better.)
Lisa and Jenna, our next door neighbor, had grown up together. Both girls were a little older than I and when we were young we played together all the time until about ten years ago. Jenna is an only child and she had this big fancy playhouse in their backyard that was almost completely hidden from view by shrubbery.
One of the games that the girls always wanted to play was house. Since there wasn't any other kids to play with that were around our age, I went along with it. We pretended to be a family. The girls took turns being the mother. I would be the father and the other girl would be our daughter. We imitated the daily life of a family, which always seemed to end up with us all lying down to go to sleep. Just innocent kid stuff.
After a few years of the same game, which I thought was kind of boring but the girls never seemed to tire of, I discovered video games. In no time I was hooked and it became almost an obsession. Then I started hanging around the kids at school with that same obsession.
Guys don't make a decision to become a nerd it just sort of happens because of your interests and the friends you have. Some of the "in crowd" start making fun of you and before you know it you are part of the lowest social order at school. You begin to accept the slights and ridicule so that your self image becomes such that you begin to dress and act the part. Mom insisted I wear clean clothes, but before I even arrived at school they always looked like I had slept in them.
Physically I wasn't exactly a gift to women. I wasn't too bad to look at and I guess you could say my body, while not an Adonis, wasn't too puny either. But, since I often forgot to wash my hair and my other personal hygiene wasn't the best, girls didn't particularly warm up to me.
It had gotten to the point that the idea of just talking to a girl, other than a few Goths that were part of our group, became an impossible dream.
Meanwhile Jenna and Lisa had gone in the opposite direction. They are definitely at the top of the "pecking order" at school and every guy dreamt of dipping his pecker into their hot bodies.
Lisa has thick, shoulder length shiny black hair with just a hint of wave to it. The kind you would just love to grab hold of and run your hands through for the luxurious feel. Her eyes are the color of sapphires and are like deep limpid pools that you can drown in. Her skin is smooth and creamy that looks good enough to lap up. Her lips are a dark rose color, full, sensuous and naturally glossy. In a word, she is gorgeous!
Jenna's eyes are emerald green and sparkle with a brightness that just pulls at you. Her skin is that permanent light tan color that looks as though she had just spent an hour in the sun and it is absolutely flawless. The kind that you would love to run your hands over to feel the softness. Just over the left corner of her upper lip is one of those Cindy Crawford moles that helps to accentuate their heart-shape. A brighter red than Lisa's, but every bit as kissable. Her blond tresses drape her shoulders like a luxurious cape and shimmer with highlights from golden yellow to almost white. She looks like a fairy princess wearing a golden crown.
Neither girl wears much make-up. Just enough to highlight the virtually flawless perfection of nature. They both have curves in all the right places. From their well endowed chests that enhance every top beyond the designer's imagination, to their flat almost concave stomachs, which they bare as often as possible and would make any personal trainer jealous. Their hips are sensuous and they have exquisitely shaped asses that somehow round up before they round out.
Both girls ooze sexuality and know how to use it. It is an unbelievable experience to see them both coming and going. From the rear, whether sashaying down the hallways at school or just walking down the street, they know how to move their delightful derrieres in a way that shouts to every guy ogling them "fuck me". From the front, while their asses are lewdly swinging they are able to move their torsos to get the most bounce and jiggle from their boobs. How is that even possible?
They wear the shortest skirts their mothers will allow and then roll up the waist when they get to school to make sure guys get a good look at their legs, which are long and shapely. They aren't too shy about letting guys get a peek at their panties, which if you can see that much you are able to almost discern the full outline of their pussies.
To put it mildly the "Playboy Twins", originally a derisive name they were first dubbed by the other girls at school, but a title Lisa and Jenna embrace, are an erotic banquet of delight to the male eye. When they come into your viewing area it is like those dessert carts at a fancy restaurant laden with so many mouth watering delights. The cart appeals to your sense of taste the girls to your sense of sight, but both put you into a brain freeze with the overload.
So when Lisa burst into my room and said she had a proposition, I was ready to listen no matter what it entailed.
"Jenna and I were talking after school. Turning 18 is an important milestone so we were trying to come up with an appropriate present for your birthday.
"When I told her that you come home from school every day and spank the monkey while watching porn and that you have a rather nice dick, we decided that we would like to give you the real thing!"
I sat there with my mouth open and my dick, which was still sticking out of my boxers, began to stiffen again.
"Did you just say what I think you said," I finally managed to croak? And how do you know so much about what I do here," I blustered.
"Oh p-lease! Isn't that what all the guys do? We see how they look at us. Besides, little brother, you don't always close your door all the way and sometimes I'll open it a little wider and watch. After a few minutes my panties are always soaked and I like to finger myself. Sometimes we both cum at almost the same time.
"You mean you didn't know? I'm usually moaning and groaning as loud as the girls getting laid. I thought for sure you must hear me."
"Is that you? Don't forget I usually wear earphones. I sometimes would hear some sounds, but I just thought it was someone else in the video background getting porked.
"No that's been me," Lisa confessed. "Girls get horny too and I'm getting quite good at servicing myself by watching those girls on your computer.
