Terribly Silly Incest

My eighteen year old twin sister, Julie, was easily the hottest girl in school. Everyone I knew I agreed on that fact. It kind sucked for me because it meant the sexiest girl around was completely off limits to me. I couldn't even count how many times I'd fantasized about her perfect body. I knew those thoughts were wrong, but I couldn't help them. It wasn't my fault she had the ability to give a guy a boner just by wearing a bikini.

Our mom and dad both had jobs that kept them away from home so much that I sometimes forgot we even had parents. That left Julie and I basically living on our own most of the time. Being left to take care of each other probably made us closer than most siblings.

The first time I ever saw my sister naked was a complete accident. I was sitting in my room minding my own business when Julie opened the door and walked in. She had a towel wrapped around her and her hair was wet. She had obviously just taken a shower.

"Whoops," Julie said when she saw me. "Sorry, Justin. I can't believe I accidentally went to your room instead of mine. I meant to go get changed."

"That's okay," I said.

I tried to play it cool, but the truth was that seeing her dressed in just a towel was kind of exciting. She was very athletic from her time as the head cheerleader, as well being captain of the school volleyball, basketball, soccer, baseball, swimming, lacrosse, football, and track teams. Her legs were perfectly toned, and her towel left them mostly bare. I wished I could have seen her butt too, since I knew how good that look when she wore tight shorts for her sporting events.

Before Julie could turn around, her towel slipped and fell to the floor. My mouth dropped open and I nearly had a heart attack as my sister was left completely naked in front of me. Her flawless round breasts and perfectly shaven pussy were on display for me. I knew I should look away, but I couldn't.

"Oh no!" Julie exclaimed, raising a hand to her mouth in shock. "I can't believe my towel just fell off while I'm standing right in front of my own brother."

She looked down at her naked body, too shocked to try and cover up. I had gotten instantly hard from looking at her, and my cock was straining in my pants to get out. I hoped she wouldn't notice my full ten-inch erection pointing straight at her.

Julie finally tried to cover herself with her hands. She put one hand in front of her pussy, and an arm across her breasts. She seemed so embarrassed to have me staring at her. I couldn't blame her, it must have been awful for her to have her own brother leering at her while she was so exposed. I still couldn't seem to look away.

She eventually decided to try and put her towel back on. She had to turn around and bend over to pick it up, but when she did I was given an unobstructed view of her perfect butt. When she bent over at the waist I could see both her little asshole and pussy both peeking out at me, I nearly died right there.

I was unable to resist any longer. I whipped out my twelve-inch cock and began furiously masturbating. Julie saw what I was doing and stood back up without grabbing her towel. She looked even more shocked than before.

"I'm sorry," I said. "I can't help it. I know you're my sister but you're just too sexy."

Julie didn't seem to know what to say at first. It took me a moment to realize that her eyes had latched firmly onto my cock as I stroked it. Instead of the disgust I expected, she actually had an expression of lust taking over her face.

"You're so big," she said with a degree of awe. "How come I never knew that?"

I shrugged. "I don't know. It's not something a sister is supposed to know about her brother."

"Well a brother isn't supposed to jerk off to his sister either," she pointed out.

Instead of respond to that, I simply let out a long groan as I reached orgasm. My fourteen-inch cock twitched and pulsed and shot an incredibly powerful blast of cum straight at Julie. I'd never cum so hard in my life, and even though she was several feet away from me, my semen landed directly on her tits. That was how turned on she'd made me.

Shot after shot of cum landed on my sister's boobs, covering them entirely in a sticky white mess. Finally my balls were empty and my cock began to shrink back down. I felt guilty for what I'd just done, and I was sure Julie was going to be pissed about it. Strangely, that didn't seem to be the case.

"Guess I must really turn you on, huh?" she said thoughtfully.

"Yeah," I said. "You're the hottest girl I know. I know I'm not supposed to think about you that way, but I do. I'm sorry."

"Hm, well I s'pose it's not the worst thing in the world. I mean, it's kind of like a compliment, right?"

"Um..."

"After all, if I could make my own brother do this," she said, gesturing to the cum that covered her chest, "that's kind of good for my confidence."

Julie winked at me and stuck a finger into the mess on her breasts. She moved the finger to her mouth and sucked on it experimentally. She seemed to like the taste and smiled as she pulled her finger back out, now clean. She bit her lip as she took a last look at my shrinking erection, then turned around. She picked up her towel and walked out into the hallway totally naked.

****

Julie spent the rest of the day teasing me. She put on her shortest skirt and her tightest top, and nothing else. She found every opportunity imaginable to bend over and show me that she wasn't wearing any panties. My sixteen-inch cock stayed hard almost constantly, which quickly became excruciating for me.

"Julie, you have to stop showing off like that," I finally told her.

"Why, what's wrong?" she asked. "I thought you liked seeing my pussy."

She flipped the front of her skirt up and made the sexiest pout I'd ever seen on her face. My cock nearly burst out of my pants at the sight.

"I do," I said. "But you're my sister. I shouldn't be getting turned on by you."

"I won't tell anyone. I kinda like knowing how horny I can make you. I know that's wrong 'cause you're my brother, but I can't help it."

"If you keep flashing me like that, I'm going to have to masturbate again. I can't help it either."

"Mmm, I can tell."

Julie stared at the enormous bulge my full, eighteen-inch erection was making in my pants. She bit her lip and absently rubbed her pussy, showing how turned on she was getting too. I was about ten seconds away from blowing my load right there.

"Maybe I should go," I said.

"No, don't go. Let me help. I'm the one who caused your problem, right? Let me fix it."

I couldn't move as my sister slid her skirt down her legs and stepped out of it. She stood bottomless in front of me for a second and just let me look. Her pussy juices were already starting to run down her thighs. I couldn't believe she was that turned on by the situation.

Julie took a step toward me so she was right in front of me, then knelt down. She undid the front of my pants and freed my cock. It was completely stiff, and when she pulled my pants down it sprang out and slapped her in the face.

"I'm sorry," I stammered. "I-"

"Don't be sorry," she said. "I kind of liked it."

She took my shaft in both hands, but it was so thick she was unable to get her fingers all the way around it. She did her best to jerk me off anyway, but it was clear that wasn't going to work.

"That feels so good," I said. "But I don't think it's enough."

Julie bit her lip. "I could give you a blowjob, but I've only ever done that once before, and the cock was nowhere near as big as yours."

"You don't have to. Maybe-"

"No," she said firmly. "I want to do this. I might need your help though."

"What do you want me to do?"

"I'm going to try and get as much of your cock in my mouth as I can. Hopefully I can get all of it. If I can't, I want you to help me."

A shiver went down my spine at the thought of my sexy sister taking my cock in her mouth. I was a little worried she wouldn't be able to, but I hoped she would.

Julie opened her mouth as wide as she could and eased the tip of my cock inside. Even though she apparently had very little practice, she managed to take almost half of my twenty-inch length in her mouth without too much trouble. However, she got stuck there and didn't seem able to get any further.

She looked up at me with pleading eyes, silently begging for me to help her take more. She looked so cute and sexy with her mouth full of my cock, and the most adorable puppy dog eyes she could manage. Her throat was already bulging and filled up, but she clearly wanted to do better.

I put my hands on the back of Julie's head and began to press gently. I didn't want to hurt her, but I wanted my entire shaft to be inside her just as badly as she did.

"I'm going to start pushing," I said. "I want you to tell me if I need to stop."

Julie obviously couldn't answer with her mouth and throat completely filled up, but she still managed to look determined. I knew she wasn't about to give in.

I pulled her head toward me harder and harder, slowly forcing myself further inside of her mouth. It was tough going since her throat was so tight around my cock. I knew I could cum any second, but I wanted to accomplish the goal we'd set before that happened. I knew she'd be disappointed if we didn't.

With every inch of my cock that disappeared into my sister's little mouth, I got closer and closer to orgasm. I wouldn't last much longer, and I still had five inches to go. When I was just about to burst I gave one hard, desperate thrust of my hips at the same time as I pulled her head toward me with all my strength. I felt my sister's forehead press flat against my tummy just before I came.

If anything, I was sure I shot even more cum this time than when I'd masturbated earlier. It just kept coming out, pulse after pulse of it deposited directly into my sister's stomach. She purred happily around my cock, which only intensified the sensations I was feeling.

After about five minutes of non-stop ejaculation I was finally finished. I looked down to see Julie staring back up at me with a proud expression on her face. I knew she was just as happy as I was that she'd taken my whole cock on her first try. She was also furiously rubbing her pussy. I started to pull my softening cock out to let her breath, but she stopped me. I instantly sensed that she wanted to finish herself off while I was still inside her.

Moments later Julie came too. Her whole body shuddered and she moaned loudly. The vibrations she sent through my cock threatened to bring my erection back, and I decided I should probably withdraw it before that happened.

"Wow," Julie said as soon as her mouth was empty again. "That was amazing! I can't believe I could take your entire cock!"

"I know. That was the best feeling I've had in my entire life. I love you so much, Julie."

She smiled even wider than before. "I love you too, Justin. I'm so glad I you accidentally saw me naked. I know you're my brother, but I think maybe you're something more too. I've never felt anything nearly as good as making myself cum while your cock was buried in my throat."

Julie stood up, and when she did I noticed how wet the floor was. She'd been kneeling in a lake of her own pussy juices.

"You must have really been turned on," I said.

She blushed a little as she noticed how wet the floor was.

"Mm-hm, I was. But I know you were too." She patted her tummy. "You filled me up with so much cum I won't have to eat for days."

We smiled at each other for a moment, then as if there were some silent signal, we moved toward each other at the same time. I'd never kissed Julie before. I hadn't even really thought about it. All I knew was that when our lips met, I knew she meant more to me than just a sister. It was just like she had said, there was something more between us than just our sibling bond.

We made out with each other for about half an hour. Neither of us wanted to stop. It felt so good to have that physical and emotional connection. Eventually we decided we should take a break and clean up the mess on the floor. Somehow I knew that wouldn't be the end for us that day.

****

I kept thinking about Julie for the rest of the day, even when we weren't in the same room. Only that morning she'd been just a sister to me, but by nighttime everything had changed. I wanted her in every way it was possibly to want a girl. I knew she felt the same way about me.

Instead of just going to bed that night, I decided to go to Julie's room. I made my way completely naked down the hall to her door. Just thinking about what we would do started to get me hard as I was walking. I knocked and waited for a response.

"Come in," Julie called immediately.

I opened the door and stepped in. It turned out my sister was also completely naked. The sight was enough to grow my erection the rest of the way to completion. All twenty-two inches of my cock were point directly at her sexy, perfect body.

"You look so beautiful every time I see you," I said.

"Mmm, I think your cock thinks so too," she said with a giggle.

"Julie, I know it isn't right, but I want to have sex with you. Even though you're my sister, I love you so much and I think we should do it."

She bit her lip and looked indecisive. "Justin, I want to too. I want it more than anything. But you're my brother and it would be wrong."

"Is it wrong for two people who love each other to show it? Just because we have the same parents we shouldn't be together? Aren't our feelings more important than what society says?"

"You're right. I want you so much, why should I let anyone tell me we can't be together."

I was so turned on at hearing Julie's words and seeing her naked that my cock was leaking precum like crazy. Her pussy was also producing juices on overtime, just like earlier when she'd soaked the entire floor. Our bodies' reactions were proof that we weren't doing anything wrong or unnatural.

Julie ran to me and we hugged each other tightly. My cock was trapped between us, pressed against her toned tummy. I kissed her fiercely while my hips started grinding my erection against her all by themselves. I was so horny I needed to be inside her as soon as possible.

"I want to make love to you now," I said.

"I want that too," she said. "But..."

"But what?"

"Justin, I'm still a virgin. I've never had sex before."

"Are you worried it'll hurt?"

"No. I know you love me so much that you'd never hurt me. I just wanted you to know."

I kissed her again and felt my cock twitch, smearing precum across her skin.

"I've never had sex either," I said. "Our first times can be with each other."

"That's perfect! I love you so much."

"Me too."

I took Julie to her bed and tried to guide her to lie down. She hesitated, and I waited to see what her concern was.

"Do you think it's okay if I'm on top at first?" she asked. "You're so big, I just think it might be better that way. I know you wouldn't hurt me, but taking you inside me is still a little scary."

"Of course," I said. "We can do this whichever way you want. The only that matters is that we do it."

I lay down on my back with my erection pointed straight up at the ceiling. Julie climbed onto the bed over me and carefully positioned the tip of my cock at her entrance. Her pussy was leaking so much that it immediately started to run down my shaft.

"Julie, wait," I said. "Maybe we should use a condom so you don't get pregnant."

She bit her lip and hesitated for a second. Then she smiled like she had an idea.

"I've got a better idea," she said. "If I tell you I'm on the pill, then our bodies won't think that I can get pregnant, so I won't. It's like the placebo effect."

"That is a good idea. I didn't want to use a condom for our first time anyway."

"I know. It will be so much better with nothing between us." She looked me right in the eyes to convince my body that her next words were serious. "Justin, I'm on the pill so I can't get pregnant."

"Okay, I'm ready now. Let's do it."

Julie closed her eyes and lowered herself gently. Her pussy was tighter than I could possibly have imagined. I didn't think there was any way I could fit inside, but somehow she managed to slide down the first inches. Only the extreme wetness of her pussy allowed us to achieve penetration. She moaned so loud at having me inside her that I worried the neighbours would hear.

"Does it hurt?" I asked.

"No," she said with the biggest smile I'd ever seen on her. "It should because you're so big and I can feel you stretching me out already, but it doesn't. It just feels good."

She lowered herself further, creeping down my shaft an inch at a time. By the time she made it a third of the way down she had her first orgasm purely from the sensation of being filled up by her own brother.

Once her orgasm had passed, Julie started working me deeper into her tight little pussy. She began bouncing gently to try and force her way further down. Her movements combined with the tightness around my shaft felt amazing and I knew they'd make me cum soon. Getting to watch her incredible naked body while she bounced just made the inevitable draw closer more swiftly.

"I can't get any further," she said eventually. "I need you to take over now."

"Are you sure?" I asked.

"Completely. This is our first time, I need to have you all the way inside me. I can't do it on my own."

"Okay, I'll do it."

We rolled over so that Julie was on the bottom. She was panting and clearly still in the throes of lust despite her recent orgasm. There was just over a third of my length left to go. She was right, the last part would be tough. Her pussy had been tight the whole way, but the amount of resistance seemed to have increased dramatically. I knew it was probably because I was bigger than her body ever expected to deal with. I hoped I wouldn't disappoint my sister and be unable to fulfill her desire.

I pulled most of my two-foot length out of her pussy, then slammed it back in. I managed to get a little deeper into her with the action. I repeated the movement over and over, forcing myself as deep as I could go in my sister's tight hole. She was moaning so loud that I was sure the people in the next county would be able to hear it.

My orgasm was approaching quickly. There was no way I could last long while fucking my sister. She was simply the sexiest, tightest girl ever, and I loved her more than anything. Because I cared about her so much I wanted to get all the way inside her before I came. It was a race against time that I wasn't sure I could win.

I slammed my cock into her harder and harder, using all my strength. She was impaled on my shaft, unable to move her body even if she wanted to. I could tell she loved the feeling. I only had a couple inches to go and I was sure by then that they would fit.

With a last mighty thrust I buried my entire length in my sister's pussy. I was just in time, because I couldn't hold back my orgasm any longer. Julie and I came at exactly the same second. The feeling of being joined so completely set us off together.

I thought my last orgasm had been intense, but it was nothing compared to what I felt this time around. I felt like my entire essence was shooting out of my cock and into my sister's body. My bursts of cum were so powerful they started to push her off of my cock and I had to hang onto her to keep her from moving. I came for over ten minutes, by which point I was exhausted and enough of my cum had leaked back out that we were lying in a sizeable puddle on the mattress.

Neither Julie or I could speak for several minutes. We were both breathing too hard, plus my mind was a blank except for her. All I could think about was how good she made me feel and how much I loved her.