Big thanks to Bert_Fegg for editing this and making it an actually coherent story.
***
It shouldn't have surprised me the way it did. Between the two of us my twin sister had always been more outgoing, more adventurous and is it turned out more willing to ignore what society deems appropriate. Still, only a few days back I would have never thought that our relationship would change in the way it had or that she would make that change so irresistible. It's too late to question whether what we have done is right or not, all I can do now is to look back and think about when it all started.
The humidity that day was suffocating like it often is in the northeast and, of course, rather than being in the comfort of our air-conditioned home Sara had dragged me with her to the park. Sara had always liked hiking and since I was her twin brother that meant that I liked hiking too. Well, liked isn't the right word, honestly, hate is more appropriate it's just that between my sister bugging me to go with her and my mother insisting that I stop being lazy and get some exercise with Sara, I had no choice.
The park we went to was large and had no shortage of trails that went up and down some very rugged and heavily forested hills. It was after climbing one of the larger hills that I begged Sara for a break. Between the heat, the humidity, and my feeble efforts to fight against gravity I was a sweaty mess and out of breath. Sara, who was far from winded had mercy on me and let me have a few minutes to catch my breath. While I was hunched over and trying to suck down as much air as I could get, I heard the distinctly condescending laughter of my twin which caused me to look up at her. Sara was breathing quite easily unlike me, although I did notice that I wasn't the only one that was sweating. The tight blue tank top she was wearing clung to her skin thanks to the added moisture and showcased the flatness of her midriff and the curve of her breasts.
"See something interesting Adam?"
All too late I realized that I was staring and looked up to her face to see Sara looking at me with a vicious smirk on her lips. All I could do was smile back sheepishly and say, "This heat is making me space out."
"Sure it is," Sara answered with heavy sarcasm. It was obvious that Sara didn't buy my excuse and I felt mortified. Getting caught ogling a woman is always pretty embarrassing but when it's your sister that catches you its hard not to feel like a pervert.
"Come on; let's get going already you lazy bastard."
Sara set off along the trail again leaving me no choice but to follow after her. Having only just been embarrassed for looking my twin sister over I did my best not to stare at Sara's ass or the slender legs that her shorts exposed, but it was difficult not to. I guess you could say that I've always been aware of the fact that my sister is attractive and I'll admit that I've peeked at her before but it was mostly curious glances. This last incident was the first time that I had been caught staring by her or at least the first time that she had made it clear that she knew what I was doing. Rather than continuing with my less than brotherly behavior and potentially reliving the embarrassment of that incident over again, I ran to catch up with Sara and walk side by side with her.
Rather graciously for her, Sara let the tank top incident go and we exchanged idle chit chat about our plans for the summer and what classes we planned to take once we went back to school for our third years. Eventually the hike came to an end when we made it back to the lot where Sara's car was parked. I collapsed into the passenger seat feeling drained while Sara slid into the driver's seat effortlessly. Sara started the engine up and cranked the A.C which helped me feel a little less exhausted as I stared off into space.
"Adam," I heard her say.
With the miniscule amount of energy I had left I turned my head to the left to see Sara looking at me.
"Thanks for coming with me; I know you didn't really want to." The smile she gave me seemed unusually genuine for Sara; usually when Sara smiled at me it was because she had something to lord over me. While we had always been close, our sibling bond had been characterized by a friendly competiveness and a healthy exchange of insults. Moments of open affection or appreciation are rare between us and there was a warmth and intensity to her eyes that I hadn't seen before. Being her twin brother I thought I knew all of her looks and moods, but this was something new from her and I felt exposed and unsure of what to do while she looked at me with open warmth in her eyes.
"It's no problem really, don't worry about it."
Sara looked at me a little while longer but eventually turned away and put the car in gear for the drive home. At first I felt relieved when she looked away from me but that relief died when I became aware of how awkwardly quiet the drive home had become. After only a few minutes I caved and switched on the radio, there was something about the silence between us that made me feel uneasy.
***
Later that night after dinner I partook of an activity that was more my speed; sitting on the couch and watching T.V. Sara was the first to join me in my lazy activity when she plopped down on the couch next to me. Our Mother and Father joined us in the family room a few minutes later and we all watched Television until about half past eleven. With a tired sounding groan our Father rose from the loveseat He and our Mother had been sharing before he said, "Alright Kids I'm going to bed. Try to keep the noise down."
"O.k. Dad," me and Sara replied in unison.
As dad moved towards the stairs our mother stood up as well. "I guess that means I'm going to sleep too. If I woke him up later I'd never hear the end of it. Goodnight kids"
"Goodnight Mom," we replied in unison again.
With me alone with Sara again I noticed the awkward feeling from before return. I still felt vulnerable being in the same room as my twin and it was difficult to converse with her they way we usually did. I didn't know why but ever since that strange look she gave me before our ride home I found it nerve wracking to be alone with Sara.
After twenty endlessly awkward minutes of me trying to keep up our usual exchange of quips I caved in and stood up from the couch and said, "I'm going to bed."
"Really?" she asked with obvious confusion and I think even a little disappointment in her voice. "You're usually up so late."
With my withdrawal from this situation imminent I felt comfortable speaking to her again."Hey, I normally do but someone had to drag their twin brother with them to the park and tire him out."
"Sorry," she responded with a grin,"But someone has to keep my lazy brother in shape." After scratching the back of her neck nervously she spoke to me again, "You know what Adam, I'm tired too."
I headed for the second floor and Sara followed after me. I don't claim to be a very perceptive person but I swear I felt her eyes on me the entire time I was climbing the stairs. Just before I could reach for my bedroom door I heard her say my name softly and I turned round to find her standing only a few inches from me.
"Um, is there..." I was caught by surprise when she wrapped her arms around me and leaned her head against my chest. "Is this some special occasion or did I do something right today?"
"I'm your twin sister you jackass! "Sara said in a stern voice that sounded just short of being angry. "I'm allowed to hug you."
