Growing up with a sister only a year younger than myself had it’s ups and downs. Being a shy child, I had a few friends but didn’t get out much.

Emily was the outgoing type. Her best friend Amy and she used to pick on me from time to time. I didn’t mind this too much. I thought Amy was cute and had a little crush on her. Amy had a bad habit of farting in front of my face every chance she got. I found out later that she was lactose intolerant and would drink a little milk before coming to our house for just this reason. My sister Emily found this fetish of hers to be amusing.

My sister and Amy would often be mistaken for sisters themselves. Their bodies were almost identical.

As I got older and noticed how sexy Amy’s ass was, I would anticipate her “farts”. Sometimes she would wear a short skirt and pull it up so I could get the full effect. I think that she peed a little once while trying to force one out.

Afterwards I would go to my room and jerk my cock thinking about her sexy little ass and driving my cock deep inside of it. The thought of her piss sneaking out turned me on too.

She got bolder in her actions the older she got. Sticking her ass closer to my face and watching my reaction between her legs. She saw my cock getting hard while a loud, juicy one escaped her asshole. She smiled at me and said to Emily that she thinks I’m starting to like it.

If she only knew…..

Over the next couple of years, I got bolder too. I would intentionally inhale deeply. The pungent scent would intoxify me. When someone else would fart I rated them against Amy’s.

While I was jacking off once I thought about sticking my tongue inside of Amy’s cute little asshole while she was blowing me a kiss. I came so hard and so much that it was all I could think about for days.

My cock got hard as soon as she walked in the door. I knew that it was coming. I just didn’t know when she would let loose.

Emily even got in on it once in a while. She noticed my turned on tent in my shorts. I quit trying to hide it. I knew that Amy was getting excited too.

She’d come around more often and fart so much that Emily asked her if she was only coming over to blow me kisses.

I was walking past Emily’s room one night when I heard her say….

You want to do what to Kevin????!!!!

Of course I stopped and listened. She talked to Amy constantly on the phone when they were apart.

“You want to… shit on my brother????”

Emily then proceeded to call Amy a sick twisted little bitch.

I ran to my room and jerked my cock thinking about what I had heard.

My heart raced. My tongue got hard. I thought about Amy’s tight little butt pushing a log out onto my chest, my face and into my mouth. I couldn’t believe that this was making me so excited.

I had only thought about her farts and pee before. Just as I was starting to shoot my first load on my chest and stomach…..

Knock knock… Knock!!!

Kevin…. It’s me…. Emily.

The door opened.

Emily stood there as my cum was shooting repeatedly on my chest. Her eyes as big as saucers. Her mouth was gaping open.

I grabbed for my sheet as fast as I could, covering myself as I was still cumming.

“C…. C…. Can I talk to you???” Emily asked.

I was so deep in twisted thought I could barely respond.

“Yeah, I guess.”

Emily sat down on the edge of the bed, staring intently at the growing wet spot on the sheet. My cock was still hard, twitching, cumming….

Emily and Amy looked so much alike in the bodies but Emily is blonde and Amy is brunette.

Looking at her body was making me think about Amy even that much more.

I don’t know who else to talk to.

Amy said something that disturbs me…. but turns me on at the same time.

Really….????

Her eyes kept looking at the sheet.

Is she interested in you??? I knew what she was talking about but didn’t want her to know that I knew.

Nooooo….

Well… What then???

Ummmm……

You know when Amy farts on you????

My cock was spasming uncontrollably when she said that. Cum still oozing.

Yeah….???

Well… Ummm….

You can tell me…

I gave her that smile that always worked before for getting information from her. In actuality, I couldn’t wait to hear what Amy had said coming from Emily’s lips.

She looked up from my hard-on and into my eyes. She swallowed hard.

She has had thoughts of…. of…..

Of what…???

I was edging her on. I wanted Emily to tell me every detail.

Of… Of….

Ummmm…. She wants to shit on you.

I started cumming again without even touching myself.

I couldn’t believe that she said it.

And that turns you on???? I asked.

Emily saw that my cock jumped and was creating a bigger wet spot in the sheet.

Emily looked embarrassed and confused at the same time. Her hands dropped between her legs, covering her pussy. Her thighs pushed together.

Still staring at my hard-on, she said…..

Ummmm….

Yes…..???

I wanted to know what Emily was thinking.

My cock was oozing and creating a bigger wet spot in my sheet. Emily was watching it grow and spasm. Her eyes were fixed on it.

You know when Amy would fart on you and in your face…??? She paused and looked up at me.

Uh huh. I answered.

I was staring deep into my sister’s eyes and thinking of where this was heading.

I…. I thought about shitting on you myself.

My nice little sister just shocked me beyond belief.

And… That turns you on…???

Emily looked back down at my cock.

I’m so embarrassed Kevin. Amy doesn’t even know. When she told me that she wants to do it. I couldn’t believe she was reading my thoughts.

I reached my hand out to her. She grabbed it and leaned over onto me. Her face inches from my cock. It was still as hard as ever.

I rubbed my fingers through her hair, totally shocked by what I learned. Not just Amy, but Emily too wanting to shit on me.

Kevin…..????

Yes Emily…..????

Can I see it???

See what???

Ummm…. Your cock.

I felt her fingers touch the wet sheet. Her hand resting on imy cock, lightly rubbing my stomach.

I looked down at her and realized that if I do, things will never be the same again for us.

I started pushing the sheet down. My cum was exposed on my chest and stomach. My cock head was coming into view. Emily’s eyes widened……

---