I'd been away from home for two years while finishing my degree in Engineering at the University of Pennsylvania - staying over summers for internship programs.
I was coming back to Seattle to attend grad school at the University of Washington. My mom works in the aeronautical industry and has done well for herself despite being a single mother. She lives with my twin 18-year-old sisters, Chloe and Casey.
I spent the first couple of weeks just getting re-oriented. Mom looked pretty much the same - tall, brown wavy hair, and an athletic build. She played volleyball in high school and college and has stayed active. Chloe takes after her, the star player on her high school team, whereas Casey is into running. Both look very much like their mother, only 23 years younger.
That was the biggest thing to get used to - my sisters. They'd gone from braided hair and chasing each other around the yard to full-on adult women. They'd both filled out a lot and I was surprised to learn that neither of them had a boyfriend.
I had no clue what was about to happen when Casey went away to volleyball camp and my mom went out of town on a business trip. Both would be gone the entire week.
Chloe and I were just hanging out one evening, watching some inane love story movie. In one scene, a couple of women were flirting with each other and ended up kissing, passionately, right before a commercial break.
"Do you think it's all right for women to kiss?" Chloe said, still looking at the screen.
"What?" I said, putting the TV on mute.
"Is it okay to kiss another woman?" she asked again.
"Um," I responded, "sure, if you're into women. Are you, into women, Chloe?"
"I don't think so," she said. "I was just curious what you thought."
"Women kissing or doing whatever they want with each other is fine by me," I said.
Chloe glared at me and grabbed the remote, turning the sound back on.
The next day I was doing my laundry and found a pair of girl's panties in the dryer. I was pretty sure I'd not brought any home - accidently taking a pair belonging to one of the girls I'd slept with at UPenn.
I was just going to drop them on Chloe's bed - she and Casey have separate bedrooms but share a bathroom. As I turned to leave, I notice Chloe's laptop open on her desk. She had up a paused video of two lesbians in an embrace, their lips and tongues locked together.
The video featured one of my favorite actresses so I un-paused it, just for a few seconds.
"What are you doing?" Chloe demanded as she stormed out of the bathroom.
"So, you
are
into women!" I said.
"None of your business!" Chloe said, slamming the laptop closed. "But it looks like you're pretty interested in two women making love!"
Chloe motioned to my crotch. I was wearing running shorts and not much else. I hadn't realized that my dick had responded quickly to the lesbian scene. It was now semi-erect and beginning to stand up like a tent pole. I have a rather large dick, so it's been particularly hard to hide my erections.
"Sure, I'm interested!" I said. "It turns me on. What's wrong with that?"
"Oh, nothing I guess," Chloe said. "I just have never thought of my brother that way."
Later, we were eating pizza and binging some old shows. Chloe paused the recording and turned to me. "Do you have sex a lot?"
"Shit, Chloe!" I said. "What kind of question is that?"
"It's legit. I haven't seen you in like two years and you're good looking and well, you've got a big thingy so I assumed lots of girls would love to fuck you!"
"You think I'm good looking?" I asked, surprised she'd even noticed.
"Sure!" Chloe said. "I'm not blind."
"Well," I said. "In answer to your question, yes, I do enjoy sex."
"Do you ever sleep with more than one girl - you know, a threesome?"
"We're getting a little personal, Chloe, but yes. I've had some threesomes. They're pretty awesome!"
"Wow!" Chloe said, her eyebrows raised. "Have you ever, I mean, um, been with a girl for her first time?"
"You mean have I fucked a virgin?"
Chloe nodded.
"Yes, I have," I answered.
"Did she like it?" Chloe asked.
"She did, Chloe. She came more than once."
"Oh!" Chloe said, looking down as if she were embarrassed.
"Did that make you feel uncomfortable?" I said. "You asked."
"No," Chloe said, still looking down. "I really wanted to know, that's all."
We continued watching the show and Chloe headed to bed shortly thereafter.
The next day I was going to my room, which is across the hall from Casey and Chloe's bedrooms. I heard a noise coming from Chloe's room, so I peaked in. Chloe wasn't there but her tablet was set up in the middle of her bed. I got really curious and looked. A video was running on the screen depicting a brother fucking her sister!
I was so shocked that I backed right out. Just in time too as Chloe came in from the bathroom. She'd left the door ajar, so I just stayed outside to see what she was going to do.
Chloe was wearing only a bra and panties. I noticed just how much she'd grown. Her breasts were very full and large. I could see outlines of her nipples in the fabric of her bra. I was immediately getting turned on - which felt weird and great at the same time. This is my sister!
I also noticed something about her pink panties. Not only did they barely cover her pussy, but they had a dark stain on the front. I realized at that moment that the stain was her juice. My sister was aroused!
She got up on the bed, carrying something in her hand. She pulled her panties off in one swift motion. I was greeted with the sight of my younger sister's pussy. She had a trimmed, light brown bush. Her pussy lips were swollen and red and dripping with moisture.
I couldn't help myself but reached into my shorts and grabbed my already fully erect dick and started stroking myself.
Chloe took what she had in her hand and rubbed it against her pussy lips. It was a dildo! Shaped like a penis, it had a head and everything. As she rubbed it along her slit it became wet and slick.
She un-paused the video and I could hear the sound of fucking.
"I want your cock in me, brother!" a young woman moaned. "Fuck me!"
As the brother in the video apparently obliged, Chloe began inserting the dildo up her pussy. As the couple in the video began moaning and breathing deeply, so did Chloe.
"Fuck me, brother!" she gasped as she shoved the dildo in even deeper.
Suddenly her hips shot up and she cried out. Her legs spasmed and I could tell she was coming.
I felt myself climax and ropes of cum streamed out into my shorts. I practically fell over by the intense feelings of watching my sister masturbate to a video of incest. I quickly retreated to my bathroom to clean up.
My mind was reeling. What was Chloe up to? Was she just sexually curious all of the sudden? Was she attracted to me, her brother? With her looks she could have any boy she wanted.
I decided it was just a phase. Just sexual curiosity. Nothing to worry about.
That's not what my cock thought about it. As I tried to fall asleep my mind kept wandering to the sight of Chloe's pussy and that dildo and her coming. Before I knew it, I was jerking off and cumming in my sheets. Fuck!
The next evening, I decided to face her off. We were sitting on the couch, not really doing anything. I was wearing my usual shorts and a t-shirt. Chloe was wearing a fairly low-cut top and a pair of very short shorts. It made it hard for me to concentrate.
"So, Chloe," I said. "I have a confession to make."
"Okay, brother," she said. "Shoot!"
"Last night I was passing by your room, and you'd left the door open."
"You came in my room again!" Chloe said, indignant.
"Not only had you left the door ajar," I said, "but you'd left a video running on your tablet."
"Oh shit!" Chloe said, turning a bright shade of pink. "You saw?"
I nodded. "And that's not all."
Chloe's eyebrows shot up. "You watched me ..."
I looked down, somewhat embarrassed. "I did."
"So ..." Chloe said. "What did you think, of me?"
I looked up. She was not mad. She actually had a smile on her face. This was new.
"Well," I stammered. "I think you're absolutely gorgeous. And watching you cum like that ..."
"What? Never seen a girl cum before?"
"It's not that," I said. "You are my sister, though. But ... well, I came too."
"You did?" Chloe said, surprised. "Right outside my door?"
I nodded. "All over my shorts."
Chloe laughed. "You must have had some clean up job!"
I laughed too. "I did have a lot of cum!"
"I guess so, out of that huge thing!" she said, looking down at my waist.
All this talk of sex and cumming had gotten me aroused. Very aroused. Since I wasn't wearing any underwear, my cock was sticking straight out from my body.
"Am I embarrassing you?" I asked.
"Not at all," Chloe answered, still staring at my erection. "Just curious."
"Curious?"
"I want to see it," she said, looking up into my eyes.
"You want to see your brother's cock?" I asked, eyes wide open.
Chloe nodded. "I haven't been able to get it out of my mind since the other day."
"You know this isn't right," I said, trying to talk some sense into her head, even though my dick was getting even harder at the thought.
"It feels right to me," Chloe said. "I just want to look."
"Well, okay I guess," I said.
It took a bit of effort to get the waistband of my shorts over my now rock-hard cock. The shorts kind of flipped over and my dick sprang out, swinging and swaying a bit as it came free.
"Fuck!" Chloe said. "It's even bigger than I imagined!"
"You imagined my cock?" I said, noticing how my dick was twitching with excitement.
"Well, now you've seen it," I said, and made like I was going to pull my shorts back on.
"Wait," Chloe said. "Now that it's out. Would you let me touch it?"
"I thought you just wanted to look?" I said.
"I lied," Chloe said, reaching over and gently taking my cock in her hand. "It feels so soft and yet so hard!"
She grasped my dick, though her hand would not go all the way around it. It got me so aroused that I flinched.