Author's note: This story contains a lot of fairly debauched incest. If that's not your bag, I'd recommend finding something else to read. If you like the story and want to see it head in a certain direction, leave a comment and let me know - I may or may not take it where you want, but I'm always happy to get feedback!
It was the first day of summer and the day after my eighteenth birthday. I was at home playing some computer games when my phone buzzed with a text message from my sister Isabel. "Hey bro. I have a favour to ask. My laptop is going really slow. Can you take a look at it?" The request was straightforward, but little did I know how deep the rabbit hole that message would take me down was.
My name is Alex Jones. I just turned eighteen and will be starting my senior year in the fall. I'm a bit of a nerd - I like computers and video games, but I also do long distance running. None of that 'fat lonely geek' bullshit stereotype here. Well, except maybe the lonely part - I've never really had a girlfriend. I don't let that get me down though; I've got some good friends and an amazing family.
My dad, Lewis, works for the government's foreign service - he's away a lot - and my mom, Pamela, is a librarian. I have three sisters. The eldest is Fianna; she's at college studying to be a doctor. Next in line is Catherine. She goes to an acting school in the city. I love my big sisters, but the sister I've always been closest to is Isabel. She's only a year older than me. I'll really miss her when she goes off to university this autumn, but for now, I've got the whole summer stretching ahead of me.
Mom's chinese, so my siblings and I all have black hair and brown eyes, but dad's from the UK and is 6'2". As a result, we're all a pretty tall bunch - I'm 6'4" and my sisters are all almost 6' tall as well. To be honest, I've always found my mom and my sisters extremely beautiful, but, well, more on that later. You'll see.
I went into Isabel's room and sat down at her desk to check out her laptop. Sure enough, it took forever to boot up. I stood up and stared out the window in front of me while I waited for the operating system to load. Mom was outside on the patio, wearing a dark blue bikini. Whenever we visited them, her sisters would always laugh at how dark my mom's skin was. Like a lot of chinese women, they tried to keep their skin as white as possible. Mom didn't care, though. She liked the sun and didn't mind the tan she got. I didn't mind either. I thought she looked stunning. She kept in good shape, she didn't let being in her early forties slow her down, and her stomach was toned and flat despite having had four kids. As I watched from the window, she walked over to the edge of the pool, her ample breasts bouncing slightly under her bikini top. I knew it was wrong, but I felt my cock throb in my boxers as blood pumped into it. When she bent over to test the water with her hand I couldn't help but stare as her plump, round ass raised towards me. I reached down to shift my engorged cock to a more comfortable position in my boxers and sighed as I watched her execute an elegant dive into the water.
A chime from the desk beside me brought me out of my reverie as Isabel's computer let me know it was finally finished it's laborious boot up and I sat down again to begin trying to figure out what was going on. After some sleuthing, I discovered she had a ridiculous number of useless and somewhat harmful background processes running and I started shutting them down and trying to uninstall them. It wasn't very exciting stuff, but what I found when I opened her browser to install some anti malware software was the exact opposite.
Her download folder was full of porn. Not just the vanilla stuff, either, although there was plenty of that. It was pretty much an a to z of debauched sex. I picked one at random and opened it up to see three guys stuffing a stacked blonde full of cock-meat. Below the desk, my dick sprang to attention once more and I unzipped my jeans to give it some air. Half an hour later I was still clicking through her library of depravity and my engorged organ was pulsing uncomfortably. Finding out my sister was such a porn-hound was pretty surprising, but the next video I opened doubled my astonishment. It was of Izzy. She was naked on her bed, legs spread, a huge dildo half in her cunt. My penis tensed urgently.
"Oh, jesus, Alex, I didn't think you'd find that!"
My stomach did a somersault as it tried and failed to climb out my mouth. It was Isabel's voice. I hadn't heard her get home, and here I was sitting in her room, nursing a massive erection while watching a video of her masturbating with a horse sized dildo.
"Um, yeah, sorry, I was just fixing your computer and I stumbled on it," I stammered, trying to surreptitiously stuff my cock back into my jeans. The damn thing was too hard, though, and I was still in the process by the time Isabel had rushed over to the desk to slam her laptop closed.
Her eyes went wide as she looked down to see my rampant hard-on. "Holy shit, bro!" she exclaimed. "That thing looks painful."
I blushed furiously and stood up to try and make it easier to put my cock back in my pants. "Sorry! I couldn't help it!"
"Hey now, not so fast," she said. "You've seen my embarrassing shit. Only fair I get a look at yours." She swatted my hands away from my crotch and smirked as she stared at my bobbing phallus.
Isabel was skinnier than my mom and my other two sisters, but my mom's genes left her with an impressive set of tits and the spaghetti strap tank top she was wearing displayed those assets well. She was wearing a tiny pair of jean shorts and had her shoulder length black hair up in a pony tail. She looked amazing, as usual. I felt a heavy bead of pre-cum ooze from the tip of my dick as she inspected it.
"Why isn't it going away?" she asked.
"I don't know," I said, embarrassed. "It's not like I have total control over it. Can I go now?"
"Not yet," she grinned evilly. "Make it go down and then we're even."
"What the fuck, Izzy," I whined, "do you know what you're asking?"