The best incest story I've ever read :D
I've found in on Reddit, probably the best post ever on Incest category.

Mother and son hot story.
It has 5 parts, really worth reading, read it by order.

http://www.reddit.com/r/incest/comments/1rpy3v/i_was_my_moms_replacement_husband_5/

I used to play tickle games with my younger sister when we were growing up.

I learned to masturbate at 11 years old and from that moment on, I was hooked. I loved jerking off and was always trying to find different ways of making my jerk off sessions better. I experimented with sticking my cock into various openings, wrapping things around my cock and using different lotions, gels and oils to make my jerk off sessions feel better. I resorted to using our vacumn cleaner for awhile, and even tried jerking off into plastic bags filled with my little sister's hair setting gel. I used fur lined gloves and then discovered a rabbit fur that was around the house. There weren't many slippery items around our house that hadn't been splattered with a good dose of my jizz.

Few weekends ago, I went to visit my friend. He took us to a pretty big party. The only person I knew there was him. He met up with his buddies and they all wanted to play beer pong. He teamed up with his friend and I got paired up with a fat girl wearing a shirt and jeans a bit too small for her. Her name was Beth. I estimated this girl to be pretty drunk by this point. And for a fat girl, her face was somewhat attractive.

The host let everyone know the shutout rule - naked lap around the building with your hands behind your back. I had no intentions of getting shutout.

We won our first and second games (Beth only made one cup). Then our third game, we got shutout. I was horrified, but realized I would never see these people again. So I took off my shoes, and looked over at Beth. She was already naked and running out the door. I quickly stripped down and followed her.

The rest of the party was looking out the window and laughing, but none followed us outside. Being in much better shape than she, I was able to catch up to her. Her fat ass was bouncing in a very un-attractive way. I passed her, and looked over. Her stomach fat and tits were bouncing in an eerily erotic way.I tried not to stare as we turned the first corner of the building, or so we though. They failed to mention that the whole complex was one building, so it was a really far fucking run.

She slowed down once she realized how far it was, and so did I. She didnt say a word to me or look over at me, but I was still sneaking glances at her tits. I did my best to ignore the fat. Then I realized I had gotten a boner. Running with a boner is awkward. I am pretty sure she saw it, because I could see a smile on her face.

We turned another corner and there was no lights on this side of the building. Out of nowhere,I felt her left hand hitting my chest. She rubbed my chest, and started movign her hand down. THen she grabbed my dick and started jerking. Our running pace had slowed down to a walk. My eyes had fully adjusted to the darkness, and I could make out the outline of her body. I moved in front of her, and picked up her tits in my hands.

They were some of the heaviest tits I had ever felt. I started touching her nipples, and her tongue licked my lips then forced its way inside my mouth. We made out and I played with her tits and she stroked my cock. I felt my dick poking into her fat rolls.

She licked my neck and down my chest as she started squatting. She gobbled up my cock. She clearly had some dick sucking skills. Looking down, it looked like I was getting a blowjob from a blob. It also looked like she was masturbating.

Then, still squatting, she started to lean back and plopped on the ground on her back. I swore I felt the earth shake. With her legs spread open, she said "Fuck me, fuck me, fuck me" over and over again. Thinking with my dick, I got between her legs. She was holding her fat up with one hand and guided my dick into her pussy with the other.

This girl liked it rough, and talked dirty throughout. "fuck my pussy, fuck my pussy, I want it to hurt." I dont think I have ever fucked a girl as hard. I grabbed, slapped, pinched, sucked, bit her nipples. She started to grab at her fat rolls, and it sounded like she was crying. But that was actually her orgasming. And the only reason I figured that out was her saying "oh my god I just came fuck that felt so good," and continued to rub her fat.

I kept pounding away and I could feel it building up. I told her "shit I am going to cum," and she told me "pull out now." I pulled out, and this fat bitch moved fast. She inhaled my cock down to the balls (several times), then took it out and started jerking until I came on her face. I had not jerked off in a week, so it was quite a load. It started dripping off her chin and onto her tits. I had forgotten that there was nothing to wipe her down with. She sucked the last bit of cum out of my dick, then started to wipe the cum off her face with her finger into her hand. She then licked her hand. She continued this until she was certain her face was cleaned. She got up and started walking back the way we came. As we rounded the corner and it became easier to see, she asked if there was anything else on her.

Her tits were covered. I was tempted to not say anything, but I pointed to her tits. She said "oh fuck," and proceeded to wipe it all on her hands and lick it off. Then she started to run back to the apartment.

We got in, and the beer pong games had continued. Everyone stopped dead in their tracks and stared at us as we came in and started cheering. She grabbed her clothes and went into the bathroom. My friend yelled out "what the fuck took you so long? Were you two fucking?" I probably had a shit eating grin on, and he yelled "yeah they fucked! hahah they fucked!" Everyone started cheering. Beth came out of the bathroom, and looked embarrassed. They cheered her on as she walked to the door and left.

THen they all turned to me, and I realized I was still naked. So I asked "ok, whose next?"

Im a Computer Technician and these are my WINS!!!! There is more of this set and many more sets to come if I get the appreciation I deserve for sharing.