All characters are 18 or older.
*
My name is Robbie and the fantasies of my sister start in high school. Growing up my sister Nancy and I were typical siblings. We hung out, we fought, we knew a lot of the same people, helped each other with homework, and sometimes went out of our way to get the other in trouble. She's my twin but not identical. Nancy was totally Irish with her red hair and pale, lightly freckled skin, while I had brown hair and eyes. My parents didn't plan on having kids but accidents happen and they weren't too eager to have anymore, so it was just the us two.
Our normal routine was to get up, eat breakfast with the folks, and head to school. Nancy and I shared one class and that was anatomy, other than that we may see each other in the halls but otherwise we wouldn't see each other until we rode home together. After arriving back at home we would do our homework, go out with friends or veg around the TV, and eat dinner before going to bed. Nancy never played sports, but she would always come to my football and baseball games. We were my version of normal as far as teenagers went.
During sleepovers my friends would always ask if Nancy had a boyfriend, if I ever saw her naked, if they could trade me something if I would steal her bras or panties, or even take a Polaroid of her in the shower and give the pictures to them. Of course I would get mad and make them change the subject. Who would do something like that to their own sister? That would make me a perv and I couldn't humiliate my sister like that. Everyone knows what high school kids are like. Word would spread like wildfire and everyone would know that some sicko was stealing his own sisters under garments and snapping naked pictures of her ruining both of our lives.
Things changed for me one night on a quiet Saturday. Our parents were out at some fund raiser getting plastered leaving us home alone. We were flipping through channels and came across a movie where two adolescents were trapped on a deserted island and it just so happened that they were having sex with each other, or mating as they put it. This was obviously unnatural and seemed weird to me. I looked at Nancy to gage her reaction and she just raised her eye brows and smirked at the television. Starting that night my fantasies began to change from my sister's friends, especially her friend Becky, to my sister.
The next morning I felt different, not guilty, but definitely different. When I came into the dining room my sister was sitting there in her PJs, one foot on the seat of the chair and one foot on the floor spooning cereal into her mouth while reading a magazine. I noticed things I never gave any thought to before. Her long red hair, deep emerald eyes, full C cup breasts, and tight body. Red heads are a strange species in my opinion, either they're incredibly hot, or not so much. Flat as a board or big breasted. No in between, but that's just my opinion. My sister was very attractive. Then she caught me checking her out!
'What are you looking at, tard?'
'... Just wondering if I should jump in the shower now or risk being late cuz you take forever, thunder thighs.'
She wrinkled her brows and flipped me the bird as I turned around to head to the shower. 'Quick thinking, but thunder thighs?' I thought to myself. 'Stupid!' I muttered as I shook my head. As soon as I got into the shower my hand was wrapped around my dick with the same effect as last night. I almost had to sit down because my legs almost couldn't hold me up.
'Can I drive today?' Nancy asked holding the car keys up on her index finger, twisting her body back and forth.
'Go head' I sighed but all I could think about was her lips against mine. I was going crazy.
On the way out the door all I could do was watch her ass and hips sway from side to side, and I realized I was caught again when she suddenly stopped and I looked up and she was staring into my eyes as if to say 'are you serious?'
'Down perv. Did you remember your wallet? I'm not loaning you any money today'
'Yeah... Take it easy, I thought you had gum on your butt.'
'Pfff! Whatev just get in the car.'
The whole way to school I stole glances, but tried not to overtly stare. Apparently I wasn't very good at it. I was very distracted all day with thoughts of my sister; I even went as far as changing my routes between classes to see her in the hallways. This went on for a week, until my sister confronted me in anatomy.
'Why am I seeing you more and more during the day?' She asked me
'I don't know. I guess I'm just not in a rush to get to class' I answered without looking up from my text book.
'So you take the scenic route? I've also noticed you always seem preoccupied to and from school, at home, and in class... And don't think I haven't noticed that you have to copy homework instead of doing it yourself. What's going with you Robbie?'
I let it hang, scrambling to think of an excuse that would be somewhat believable. 'I'm just thinking about scholarships and schools next year. It's not that big of a deal.'
'You better get your head in the game then' She stated but I wasn't sure she bought it.
The rest of the day wore on and for once I was somewhat dreading seeing Nancy for the trip home, but it turned out to be uneventful. I went straight to my room and didn't come out until it was time for dinner.
At the dinner table it was just my mother and me. My dad wasn't home from work and Nancy was out at the movies. We made small talk until she asked 'What are you planning on doing for your birthday? I know where doing something here, but do you and Nance plan on doing something with your friends this weekend?'
'I guess I haven't really thought about it.'
Which was true since all I could think about was how much my sister had my hormones twisted in a bunch.
'Nance will probably do something with Dana, and I'll probably go out with the guys.'
Dana was Nancy's on and off boyfriend. He wasn't bad until he started talking, then he because very annoying very fast. He made her laugh, but I thought he was as idiot. Just then the gears started to turn...
After I cleaned up I started texting Becky, my sister's very hot best friend.
'Waddup? Has Nance talked about doing ne thing 4 r Bday?' I sent, eagerly waiting for her reply.
One minute seemed like 30 and I was contemplating sending another when I got her reply 'No y? Do u have sumthing in mind?'
'Yeah! Ur rents r outta town that weekend right? Lets have a party! Jason's brother can get us alcohol.' Jason was a long time friend of mine and his brother always hooked us up.
While I waited for her reply I texted Jason 'Can ur bro get us sum alcohol to celebrate mine and Nancy's Bday?'
Jason was the first to answer. 'Yup! It's on my friend!'
'Awesome!' I thought 'one down, one to go.'
My phone beeped with Becky's answer 'I guess, but not 2 many ppl! My rents found bottle caps everywhere last time! And if sum1 pukes in the pool ur cleaning it!'
Later that evening I heard Nancy come home and head straight to my room. She knocked lightly and walked right in.
'So you're making plans for me now?' she asked with a tad bit of annoyance displayed on her face.
'I thought a party for our birthday would be perfect' I answered.
'Dana and I were going to do something, but now Becky and the rest of my friends expect me to be at this party you thought up!'
'It'll be fun! Besides you and Dana can go to dinner or whatever and show up later, and I'm sure there will be a room you can sneak off to when you get there' I chuckled, hoping she would give in.
'Oh shut up! Fine! I'm sure we'll have a good time' she said as she turned to leave.
'Wait!' I said standing up, and without thinking I gave her a hug. She hugged me back, but I held on a little longer than normal.
'OK! That's enough Robbie' she pushed me off giving me a confused and almost uncomfortable look on her face.
I immediately regretted my rash decision to hug her. We don't even hug very often! She walked out without shutting my door. As I went to close the door behind her I noticed two things: she was wear a very short white skirt that immediately got my heart racing, and I my cock was as hard as a steel pipe. Was it that hard when I was hugging her? Could she feel it?
All week I was walking on air. I devised a clever OR very sick plan to get Nancy drunk at the party and see how far I could go. On one side I was so desperate to see what would happen, and on the other I was doomed if things went awry. Thursday night we turned 18! We had a get together consisting of my family and some relatives at the house. For me, it was just a small prelude of what was going to happen tomorrow night. We had cake and ice cream, read a few birthday cards, and opened a few presents. Nancy and I cleared about $300 when we combined the money we received and we agreed to split the alcohol cost evenly.
That night I could barely sleep. I went from excited to nervous and back to excited as I finally fell asleep. I didn't think much about it, but how far did I want to go? Did I want to feel her up, make out, try to slip a finger in her, or actually fuck her? I'm not a virgin, but I sure was as giddy as one. I don't know why I didn't think this through before. If my plan failed my family would probably disown me and everyone would find about the sicko who tried fuck his own sister at their birthday bash. As I started to fall asleep I thought to myself 'that's what shots are for Robbie. She'll be wasted!'
It seemed like 15 minutes later my alarm clock was going off. I was so groggy went I stumbled to bathroom to relieve myself that I didn't even notice anyone was in there. I snapped wide awake as I saw my sister buck naked getting out of the shower, reaching for her towel. She didn't notice me at first and the 10 to 15 seconds it took for her to do so seemed like an eternity, and then her eyes went wide with the realization that she wasn't alone.
'Oh sorry!' I said as I froze.
She covered up, but didn't say anything right away. 'Get out Robbie!' she yelled as she back into shower and slammed the door.
My piss hard-on turned into a rager as the image of her shaved vagina and big, beautiful, perky breasts burned into my mind. I normally go for tanned girls, but her pale ivory skin was perfect to me. I waited in the hallway for her to come with her hair and body wrapped in a towel. She looked at the floor and didn't make a peep as she passed me to go straight to her room. When I showered I came once, but I felt like I could've came three more times thinking about what I had just witnessed. Later, on the way to school it was awkward silence.
'I'm sorry about this morning. I'm not used to you getting to the bathroom before me,' I apologized breaking the silence.
'It's okay, but you could've knocked. I'm just not used to being ogled by my brother,' she said in an even tone.
'You're right, and for the record I was just surprised' I countered.
