I'm eighteen years old, and I have a brother and sister, twins, a couple years older than me, and going to college. This summer, I got a part time job at a burger joint, while they pretty much just hung around all day while mom and dad were at work. One day, I got off early because it was a slow day. As I arrived home, I was surprised to find them not sitting watching TV. I walked through the house, wondering if I had the place to myself, when I heard hushed voices coming from dad's office. I took a look inside, and found my siblings were there, talking. But, something was a little off about it. They were pressed up close, and had their arms around each other. As I tried to figure out what I was seeing, to my utter shock, they kissed. Not like a little peck on the cheek, I'm talking about a full-on tongue-kiss. It only got weirder, though. After a moment they broke the kiss, and my sister suddenly slid down to her knees. She then started undoing my brother's belt, and then his pants, as they held each other's gaze. Needless to say, my heart was pounding at this point. Then, my sister pulled down the front of my brother's boxers, and his cock bounced out. He was hard as a rock, and I was surprised how big he was, as my sister started to suck my brother off. For some reason, I felt myself getting turned on; my pussy was quickly getting moist, watching this fucked-up scene. Eventually, I got so hot and bothered, I had to go to my room, and let my pulse slow down.
The next morning, I didn't have work, but decided to sneak out of my room, so they'd think they were alone. I came back from breakfast about an hour later, and again they were nowhere to be seen, so I crept quietly through the house, keeping my ears alert. I eventually heard something, but it wasn't whispering. I found them in the kitchen this time, both naked, my sister bent over the island, while my brother appeared to be fucking her from behind. Both were making some rather interesting faces, my sister especially, and her huge tits were bouncing around so fast, they looked like they might go flying off. I decided now was the time to make my presence known.
"Uh, what are you two doing?"
Both were understandably startled.
"Fuck," my sister said with a jump, "what the fuck are you doing here?"
"I had the day off, so I went out to breakfast. Seriously, what are you doing?"
"Well," my brother stammered, "we, uh..."
"How long has this been going on?"
"Well, since the summer before we went off to college," my sister replied, "but, really, we'd always been attracted to each other since about puberty." She then smirked. "And, to let you in on a secret, little sister, your brother is really good. I mean, nobody can make me cum like him. Isn't that right, honey?" My brother blushed at this compliment. This was just getting more and more surreal. "And you know what else? He was just saying the other day how hot you've gotten." He started laughing nervously. "God, look at him acting all embarrassed and shit, but you should've heard some of the things he said about wanting to do with you."
"Yeah, she's right." my brother then said, "But let's face it, sis, I'm not the only one talking about her."
"Yeah, fair enough." My sister then stood up, and walked towards me. "You know what I'd really like right now, though, is to watch you suck him off."
My heart had been pounding before, now it ran a marathon. "You want me to...suck my brother's cock?"
"Yeah. Look at that big ole thing, don't you want to?"
My heart was going so fast, I felt I had to swallow just to keep it from leaping out my throat.
"Go on." my sister whispered in my ear, "Do it."
Breathing hard, I stepped forward, and knelt in front of my brother. His cock actually seemed to be getting harder in anticipation. Taking another deep breath, I stuck my tongue out, and licked the tip of it. It tasted salty, probably from my sister's pussy. I started licking the head all over, before finally sliding it into my mouth.
"Yeah, baby. Suck it!"
It felt kind of weird, having my brother's cock in my mouth, but I was beginning to like it, and started properly blowing him.
"Ooohhh, jeeeeez that's good." my brother moaned.
"Is she as good as me?" my sister asked.
