My adolescence was...a little strange. My parents, due to work, were almost never there, so they never found out about what went on.

I have two sisters, one two years older than me, the other one year younger. My older sister not only didn't have a problem with me watching her get undressed, she'd openly do it right in front of me and our younger sister. I remember when I got my first hard-on; it was sitting in her room, watching her. I didn't even know what it was, just that my penis suddenly swelled up, and I suspected it had something to do with watching my sister. My older sister noticed this, but, again, wasn't bothered by it.

"Do you have a boner??"

"Um..."

"You do, don't you??" My older sister smiled. "Wanna show it to me??" Reluctantly, I pulled it out. "Mmm, nice." My older sister then kneeled in front of me, and gave me my first blowjob. I didn't know what she was doing, at first, just that it felt weird, but good. After not too long, the weird, good feeling reached its peak, I felt my penis contract, and then I felt something come out of it, then I heard my sister swallowing. She took my penis out of her mouth, and asked me if I liked it. I nodded yes.

Another time, not long after that, my older sister had her panties off, and I found my self staring at the little bit of hair she had down there. She saw me looking, and asked me, "You wanna see my pussy??"

"Okay."

My sister saw on the floor, and spread her legs. I'd never seen anything like it. "Come here." I got down on the floor with her. "You know what 'eating out' is??" I nodded no. "Lean in closer." Her pussy was right in my face, so close I could smell it. "Now start licking me." Hesitantly, I started licking her. It tasted weird, but I kind of liked it. I could hear my older sister's breathing speed up and deepen. As I went, she instructed me on how to "eat her out". Eventually, my sister started spazzing out, and she let out a high-pitched squeal. "Oh, very good, little brother."

That night, I thought about what I had done, and I started thinking about my younger sister, who had just hit puberty, and was starting to develop. I decided I wanted to do with her what I did with our older sister.

I snuck into my little sister's room. As I watched her sleeping, I got another hard-on. I pulled off her sheet, then crawled onto the bed with her. As I spread her legs open, I could hear her waking up. "What are you doing??" I shushed her, than leaned in, pulled aside her panties, and started licking her. It wasn't long before she did the same thing as her big sister.

The next, I told my older sister about it. Her reaction was, "Really?? Boy, you really like licking girl's pussies, don't you?? Did she like it??"

"I think so."

"Hm, maybe I'll give her a try."

That night, walking to the bathroom, I could hear my little sister making the same sounds she did with me. Walking back, I heard my older sister, whispering, "Yes, that's it."

A little while after that, both of them approached. "I wanna teach our baby sister to suck a guy's cock. Can she practice on you??"

"Okay." Both my sisters stripped down in front of me. I pulled down my shorts, and my already erect dick bounced out. My little sister kneeled in front of me.

"Put the head in your mouth," my older sister said, "Stroke the shaft." My younger sister did everything her big sister told her to. I eventually got the same feeling I did when my older sister did it. "Now swallow it."

Some time later, we graduated to fucking. We were all in my older sister's room, and she told us to take our clothes off. She then told me to put my cock into my little sister's pussy, and then instructed me in fucking her. After making my younger sister come a few times, my older sister then told me to try on her.

After that, me and my sisters had sex with each other pretty regularly. Even now, as adults, any chance we get, we get together and have ourselves a threesome. I know it's not normal, but we really don't care. I just hope our parents don't find out.

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