Okay, this may be a lengthy story. I have to give a bit of a backstory first. Also, this may not be appealing to everyone.

I grew up in a conservative family. Went to church almost every Sunday until I graduated high school and went to college. Both my sister and I were very sheltered. I mean we were able to hang out with some friends, but most of the time we were stuck with each other at home. We were very close, if for no other reason, out of necessity. We talked about everything together, and we were each other's support system, really. Well, when I was maybe 13 and she was 11, we were watching tv and talking about boys and girls at school liking each other and all that, and we were basically just moping and complaining about our lives. We'd sit right next to each other on the couch. We'd been doing it for years and never really thought twice about it. Well, somehow that day, we came up with the idea that I'd be cool to try kissing with each other. We tried it. And it was very awkward. We tried for maybe a minute or so before we just kind of laughed it off. The next day, we tried it again. It went much, much better. We started to make out and touch pretty heavily, but eventually I got an erection, she felt it, and flipped out and we stopped. We never tried it again. I'd have loved to, but I thought she was pretty freaked out by the whole thing. We knew what we were doing was wrong. We continued to be close over the years, but we didn't go down that path again. I ended up going off to college, and shortly after college I ended up moving to another state for a job.

Fast forward to present day. I'm 27, she's 25. I've been married for 3 years. My sister, Lisa, is still single, and still lives back home, but in her own apartment. My parents still keep an eye on her, but at least she's on her own. Again, I live a few states away. Every once in a while, my wife and I do pay them all a visit.

Very recently, we were visiting them for a week. We were just staying with my parents, instead of wasting money on a hotel. Well, one night we went over to visit Lisa at her apartment. We just stayed in and drank. Lisa and my wife - Karen, get along really well. They're similar personalities, but my wife is much more outgoing and laid back about things. We were having a really good time talking, drinking, and laughing a lot. It was getting later in the evening and I could tell my wife was starting to get a bit horny. She was flirting with me a lot and doing a lot of touching. Eventually, she started to ask Lisa about her love life. Or as it turns out, a lack thereof. My sister was pleasant about it, but she was definitely getting down on herself. She admitted things weren't going well. She had only had 2 boyfriends, ever. And she was still a virgin. Both my wife and I were pretty shocked. I think she was feeling bad for asking. Karen apologized, but Lisa started to offer up more information. She said she wanted to have sex, but things just weren't going very well and she was pretty frustrated. And then she offered up that she had only even kissed 3 guys. It didn't take long for me to realize that she was including me as the 3rd guy, and I started to get nervous that she'd start talking about our younger experiences. Sure enough, my wife started asking about the 3rd guy, and sure enough, she started to say "well, David and I tried kissing a little when we were younger." I got embarrassed when my wife gave me a surprised look and started to tease me. I ignored her, got up, and went outside to smoke a cigarette. I was pretty drunk by that point. I was having a few cigarettes, as it turned out. After a while, my wife comes outside and joins me.

"So that was an interesting talk, huh?" she smiled as she said. I just kind of nodded and smiled back. "We has quite the conversation while you've been out here, too." Then she started going on about how she feels bad for Lisa and how she wished we could help her. I had already moved on from that topic. I was staring at my wife and enjoying her cleavage and began to feel her up. We were drunk and ready to go, lol. We wandered back inside together. I stopped by the kitchen to make another drink.

When I made it back to the living room, I immediately noticed that Lisa had changed clothes. She was wearing some pretty tight, short shorts, and a tank top that showed off her tits pretty nicely. She's a good looking girl. She's "chubby", but her tits and ass are very proportionate to everything else. Very nice curves. Very pretty face. Her looks have definitely not been her problem with guys. Anyway, yeah, I noticed her right away. Also, my wife was sitting right next to her, which was actually kind of aggravating because I was fully intending on getting into my wife's pants pretty quickly. I went over to sit by them, but my wife scooted over and told me to sit in between them. I complied. We sat and made some small talk. I ended up kissing my wife and trying to scoot her over a bit, hoping she'd get the hint. But she stayed firm in her spot, but very much kissed back. We made out and started groping and touching each other. We started to get pretty into it, when my wife whispers "so Lisa looks pretty hot, doesn't she?"

I sort of brushed it off and said "sure", and continued kissing. But Karen stopped me and said "no, look at her."

I turned and looked at her. She did look hot. Karen motioned for Lisa to stand up. "Let him check you out." Lisa stood, looking embarrassed, and did a quick turn. I got a good look at that huge, round ass looking perfect in those shorts that struggled to contain it. She did look great. "What do you think?" My wife asked, as Lisa sat back down next to me. I said "she looks good. But what are you getting at?"

Karen smiled. She leaned in and kissed me, and whispered "why don't you guys try kissing again?"
I didn't really know how to react, but I was drunk and horny. I went along with it. I leaned in to kiss my sister. She closed her eyes and we began to kiss. A small peck at first, but soon after, I leaned in and kissed harder, as she sunk back into the corner of the couch. It definitely turned me on. And then I jerked back, confused and worried about doing anything else.

I moved back over by my wife. "Why'd you stop? Looks like you liked it." She said, as she touched my semi-erection through my pants. Then she undid my pants and pulled my cock out over my boxers. She began to jerk me off, and then started to blow me. I leaned back and closed my eyes. I opened my eyes again and put my hand on top of my wife's head, to push her further down on my cock. Then I leaned back and closed my eyes again. She stopped blowing me, and started to jerk me and kiss me. I felt her up as we kissed.

And then my wife stopped jerking me, and within seconds, I felt a mouth on my cock, while my wife was still kissing me. I broke our kiss to look down and see that Lisa was sucking my cock. Not only that, but she had also taken off her top and bra. My wife gave me a dirty smile and told me to enjoy. I felt a mix of panic and intense pleasure. I asked her "you're okay with this?"

"Yes. You have my permission. I want to watch you guys." I was stunned. I kissed her again, but then looked down at Lisa as she sucked my cock. Her first blowjob, and it was on me, her brother. I was in heaven.

My wife made herself more comfortable. She took off her clothes, leaving on just her panties. She leaned back and started to rub her pussy and finger herself. She'd occasionally run her hands through my hair, rub my shoulder, or lean over to kiss me while Lisa sucked my cock. It was dirty as fuck, lol.

After a few minutes, Lisa seemed to be slowing down a bit, and Karen jumped in. She had taken off her panties, and then moved on top of and started to ride me. It felt great, but I was focused on Lisa at that point. I watched as she took off her shorts and panties. She looked amazing. Short and thick. My wife didn't waste much time. She was riding me hard and fast, until she started to do more of a grinding of her hips, and then she came on my cock. She leaned in with her hands on my head, and shoved her tits in my face as she was cumming. She slowly grounded her hips, but then moved off of me.

"Your turn." she said, as she looked at Lisa.
"Are you guys sure?" Lisa asked.
"Positive. You guys deserve it. And I'm pretty sure he wants it."
I looked at Lisa and nodded, and said "and you're sure this is what you want?"
"Positive" she said.

I got up and met her where she stood, kissed her, and we leaned down onto the couch together. I moved in between her legs as she spread them wide. I kissed her as I lined up my cock with her pussy. My tip found the opening, and I slid it in, slowly. Her eyes got wide, and I pushed in, hard, shoving in as much of my cock as I could. Lisa gasped and wrapped her arms around me and pulled me in close. We kissed, as I slowly thrust in and out. I'm pretty sure that if I hadn't been drunk, I'd have cum almost instantly. As it were, I only managed maybe 2 minutes of slow, deep thrusting before I pulled out and shot my load on her stomach. We stared at each other, both breathing deeply. We kissed, but I felt very disappointed. I abruptly got up, put on my boxers and went outside to smoke. I was not happy with my performance. I wanted to be better for her. While I was outside smoking, it just kept going through my head. I kept picturing my gorgeous sister and that amazing, chubby curvy body. Before I knew it, I was hard again. I had made up my mind that I was going to fuck get again. I didn't even wait to finish the whole cigarette. I put it out and went back inside, fast. They were both still sitting there, and went silent as I had apparently interrupted their conversation. I looked at Lisa and told her to get up. She did, and I took her hand and led her into the bedroom. I grabbed and spanked her ass, before turning her around and pushing her on to the bed, on her back. She moved further up onto the bed as I got my boxers off. Karen soon came in to watch.

I got onto the bed and shoved Lisa's legs open, and crammed my dick inside her. I gave her a few good fucks, before I eased back, and started to finger her clit as I moved my tip in and out of her pussy. She moaned and moaned. I kept doing that until eventually she started cumming. She was LOUD. And with that, I began to fuck her again, hard. I leaned in and had my hands on top of her head to hold her in place as I fucked that tight pussy, hard and fast. I heard Karen say "wow, baby. Get it." I had pretty much forgotten my wife was there until she said that. I was focused on fucking the girl who I still saw as my little sister, even if we are older now.

Her pussy gripped my cock so damn tightly. I just kept driving deep and hard. Every once in a while I'd switch up, and move up to where I had her legs up on my shoulders. But then I'd end up right back down on top of her, with my hands on top of her head. I'm not sure how long this went on. It felt like it was quite a while. I was definitely not disappointed with my performance. When I felt myself getting close, I whispered in her ear "Lisa, I'm going to cum." She looked into my eyes and said "do it." I kind of looked at her with a confused look. I wasn't sure, was she meaning to cum inside her? Or pull out again? So I asked.

"You mean... inside you?"
She bit her lip and nodded. I didn't even give it a second thought. I was sold.

I fucked her hard and deep. Soon enough, I was cumming inside my little sister. We kissed, hard, as I unloaded in her pussy. We actually kissed for quite a while, long after I was done cumming. It felt so damn good and dirty. My wife came and joined us on the bed. Eventually I went out to have a cigarette. By the time I got back inside, they were both asleep. My wife still naked, and Lisa wearing my shirt. I ended up hanging out by myself and drinking more in the living room, trying to process everything that had just happened. And then worried what the reaction would be in the morning. Were they going to regret it and wish they hadn't gotten drunk and done it? Did I just really screw up? Eventually I passed out and slept on the couch.

The next morning, I woke up to Lisa, sitting on the couch by my feet, staring at me and smiling.

"Hey." She said.
"Hey. How you feeling?" I replied.
"Great." She said. "Just going to take a shower. You... you want to join me?"

I may have been even more shocked by this than I was by the previous night, lol. I sat and stared. She took off my shirt, which was still the only thing she had been wearing. "Come on." She said.

I quickly followed her into the bathroom, locked the door, and got into the shower. We started making out before we even got into the shower. And then got into the shower, but didn't bother turning on the water. She got on her knees and sucked my cock. She may have been enjoying it as much as I was. She was very aggressive. I had my hand on her head to force my cock into her throat at times. It turned pretty rough. I wanted to fuck her again, bad. I got down and turned her around, and fucked her from behind, doggystyle. Very hard. Pulled on her hair and spanked her several times as I pounded her pussy. This was just good, pure lust between siblings. I wound up cumming inside her pussy. We did wind up taking a shower, only for me to lay her on the cold, wet bathroom floor and start to eat her pussy until she came, and then fucked her again.

When we left the bathroom, we were glad to find that my wife was still asleep. We both quietly got dressed and hung out in the living room and ate, just waiting for my wife to get up. When she did, there was some brief conversation about the night before, with her teasing us a bit, but then we moved on. She had no idea about what we had done in the morning, and still doesn't know.

That was 2 weeks ago. We're back home. Lisa and I have been texting a lot. Karen teases me, but doesn't seem bothered. Lisa wants me to ask if Karen might be okay with her moving in with us. I'm kind of afraid to ask. I'd love it. But I don't know how my wife would feel about it.

Anyway, it was the best sexual experience of my life. I never would have imagined all those years ago when we awkwardly tried kissing, that someday I'd wind up fucking my little sister.