Hi, my name is Mark, I'm twenty-one, and what I'm about to tell you could literally ruin me and my sister's lives, but I can't keep it held in anymore, I have to tell someone about our story.
It all started about six months after my sister, Danielle, turned eighteen. I was nineteen at the time, so it's not like this was a long time ago or anything.
I should say that I'd never really thought of my sister sexually, at the time everything happened. That all developed because of her...
It was early summer, but it was already one of the hottest months on record for our area, so you can imagine that none of us at home wanted to wear anything heavy. We didn't have an air conditioner, for numerous reasons, but we did have plenty of box-fans. Typically, I'd wear some light gym shorts, and a muscle shirt, to stay cool, and Danielle would wear something similar.
One day, I was in our living room, watching some TV, the fans were on max, and the windows were all open, giving a nice breeze that helped keep it close to about ninety degrees, instead of the near-hundred outside. Danielle walked in, wearing some cloth shorts and a bikini top, which only showed off her C-Size tits. It wasn't that I looked at her in that way, at the time, but I'm a guy, so I can't help but at least notice a nice pair of boobs, even if they were my sister's.
"Hey!" she said as she sat on the couch, next to me.
"Hey," I said. I wasn't really too enthusiastic about her crowding me, as hot as it was, I didn't need body heat that close to me.
"What'cha watchin'?" she asked me.
"Something called 'Criminal Authority'. Not even that good."
"Can I ask you something? Like, something sexual?"
"Yeah, sure sis. What's up?" I looked over at her, giving her my full attention.
"What turns you on... as a guy?" she asked.
"What do you mean?" I said.
"I mean, do you like tits, pussy, ass... what?" Her posture changed to favor a more relaxed, even flirty, nature.
"All of them, on some level, I guess," I answered honestly. There was no point in lying about it, and Danielle and I have always been comfortable with each other.
"Okay, what about hair color?"
"You're gettin' pretty specific, Dani," I laughed.
"Yeah, well..." she smiled, "I need a basic idea of what guys like."
"Guys are all different, you know," I remarked.
"Just answer the question," she laughed.
"Honest answer?" I gave her a serious look.
"Duh!"
"Short, bright, blonde hair. Like, just past the ears, not quite shoulder-length."
"Like, my current color blonde?" she asked. Hers was a light blonde, but she had long hair.
"Yeah, actually," I said.
"M'kay, thanks," she said as she leapt from the couch and took off toward the stairs.
"Hey!" I called out to her, "What was all that about, anyway?"
"I'll tell you later," she called back, not skipping a beat with jogging up the stairs, her tits bouncing slightly with each step.
I didn't think much of it, so I simply rolled my eyes and went back to watching TV.
The next day, I decided to play some video games, and like the day before, it was blistering hot in the house. I had my usual on, and was situated in the living room, which was the coolest room in the house, since that's where most of the air flow was. Out comes Danielle in shorts that barely covered her ass, and a tank top.
"Hey," she said, "um, can I watch?"
"You want to watch me play video games?" I asked, unconvinced.
"M-yeah," she said innocently.
"Sure, if you want." I said.
She sat down next to me and watched as I played. In the corner of my eye, I could see sweat beads on her breasts, but her shirt was perfectly dry, which told me she had just put those clothes on.
I kept playing the game, my eyes fixed again on the screen. At a jump-scare point of the horror game I was playing, Danielle suddenly jumped and placed her hand on my leg, near my crotch. I got hard, just from the fact that her hand was there. Instead of removing it when things calmed down, she kept it there, seemingly transfixed on the game as I played. I managed to glance at her from the corner of my eye a few times to see if she even noticed where her hand was, but there was no sign that she did.
After a few more minutes, I heard the back door open, causing Danielle to quickly pull her hand from my leg, and our dad yell that he was home.
"Hi, daddy!" said Danielle. She acted as though nothing happened at all.
"Hey baby girl! Is your mom home yet?" asked dad.
"No, she went to pick up some Chinese," said Danielle.
"Okay, I'll be in my study," said dad. He quickly made his way past the doorway, toward the second stairway, and I heard him go upstairs.
About a half hour later, our mom got home with the food. We never ate together as a family, we were about as dysfunctional as we could be, but I didn't complain about that fact. Most of the time, I'd just eat in my room while watching a movie or TV show. This particular night was no exception to that rule, and for the rest of the night, I stayed in my room.
The next day, I woke up and got dressed in similar clothing as the day before. It wasn't any cooler, and I had little tolerance for heat. As I left my room and passed Danielle's, I happened to glance in through the cracked-open door to see her topless, and brushing her hair while looking in the mirror of her vanity desk. I stopped and watched for a few minutes, in complete awe of her tits. She finally stopped brushing her hair, and moved in a way that startled me from my daze. I moved on past her door so I wouldn't be seen.
I made my way downstairs and into the kitchen to get some coffee made. Mom and dad had already gone to work by this time and were long gone, something I was usually glad for, because I didn't like catching them in the mornings. It was always in the morning when they'd tell me to do something around the house.
After I made my coffee and went back to my room, which I normally did as part of my morning routine, I heard a knock on my door.
"Come in," I said. I was sitting at my desk, looking on my computer as the door opened, and Danielle came in, wearing her shorts and a bikini top.
"Hey, um, my phone's stuck on my gallery, can you fix it for me?" she asked.
"Yeah, sure, let me see it," I said.
"Um, just letting you know, you're gonna see something when you turn on the screen," she said.
"I should hope so, that's what the screen's for, Dani," I joked. She giggled, handing me the phone.
"No, I mean..."
I didn't let her finish before I turned on the screen, and on that screen was a full-frontal nude pic of her.
"Whoa!" I said.
"Yeah," she said, wrinkling her nose, "pretty gross, seeing me naked, huh?"
"Um... I guess because you're my sister, but for real, Dani, you are just... wow!" I said. I swiped the screen to cycle it, bringing up even more nudes of her. "And there's more... okay, let me see if I can close the gallery, since you said it was stuck on it." I closed it and showed her the screen, pointing out that it's fine.
"That's so weird," she laughed, "it must've just been stuck until I brought it in here. Thanks anyway."
"No problem, sis," I said, going back to my coffee and computer.
"Sorry about you having to see those pics," she said.
"Nah, it's fine, Dani. Seriously, if it doesn't bother you, then it doesn't bother me," I reassured her. She simply smiled at me, and nodded as she left my room, closing the door. Immediately afterward, she opened it again.
"Hey, um, I was hoping you'd watch a movie with me, today," she said.
"What movie is that?" I asked.
"Causality 3," she said.
"Yeah, I've been wanting to see it, I mean, it's been out since '09," I said.
"Good!" she said cheerfully. "How about right now?"
"Yeah, just give me a few minutes, sis," I said.
"I'll be in the living room, getting it ready," she said. She left again, closing the door. I finished up what I was doing on my computer, then grabbed my coffee and went out to the living room to join her.
She'd already put the movie in and had the DVD on pause by the time I'd gotten there. I could hear her in the kitchen, messing with some kind of wrapper, which I later found out to be microwaveable popcorn. I sat on the couch and finished my coffee while Danielle kept working in the kitchen.
"Hey," I heard her call to me, "do you want a soda?"
"Yeah, I just finished my coffee, so I can get it," I said, standing up. I went into the kitchen and set my coffee cup near the sink to wash later, then grabbed a soda from the fridge. The popcorn finished a couple minutes later. Dani grabbed it, put it in a large bowl, and we both made our way into the living room, sitting on the couch.
As we watched the movie, she scooted closer to me, leaning her head on my shoulder. I couldn't help but let my gaze wander a bit, having a plain view of her perfect tits. I had to stop myself from getting too mesmerized by them, as I was starting to get hard, and wearing only gym shorts, it would've been extremely obvious and awkward.
Toward the end of the movie, a scene came on where the main character's sister professed her desires for him.
"Wow!" said Danielle, "That would have to be the shock of a lifetime..."
"Yeah, I guess so," I commented with a small laugh. The movie ended soon afterward, it didn't have a happy ending, though.
"You know..." said Danielle, "I kinda feel sorry for her."
"Why? She was a total psycho. I mean, she killed all his potential girlfriends, and that's pretty fucking crazy, sis," I said.
"Yeah, obviously going on a killing spree through time in totally psycho, but if she'd just... I don't know... told her brother how she felt, maybe the two could've... you know... hooked up," said Danielle.
I looked at her with a look of confusion to see her blushing, and she burst out laughing after seeing my expression.
"What?" she laughed, "Don't give me that look. Don't you think in the movie, that could've happened?"
"I guess," I laughed.
"So, like, what do you think of the idea?" she asked.
"What?" I said as I finished my second soda.
"Incest. Like, what are your thoughts about it?" she said, "It's a thing, you know, probably a fuck-ton more common than anyone wants to admit."
"Doesn't bother me if it's between two adults and they've come to the decision themselves," I said. "If it's two adults, and both consent to the act, then who am I to tell them they can't do it?"
"I'm glad you said that. I agree," she said. She got up and put the DVD back in its case and set it aside. "Fuck, it's so hot in here..." she mumbled.
"Yeah, it's supposed to be even worse tomorrow," I said. Danielle came back to the couch and used a hair tie to put her hair up.
"It's so hot, I could go naked, and still be uncomfortable," she said.
