I'm at the airport waiting for my little sister. She's finishing college and decides she wants to move into the area to follow in my footsteps. I'm impatient - she's late.

Soon, I see her come out of the gate and the first thing I notice is her ample cleavage. I try to put out of my mind as that's not what I should be thinking, she's my sister. We hug, tightly. I smell a perfume that makes me want to hold on to that hug just a little longer.

It's just like old times, we catch up, go into town, and a few hours later we find ourselves a little drunk - man, she's definitely able to hold down her booze but it's getting really late. Time to head home.

Once there, we get settled down and I go find the pillows and blankets for the spare bedroom while she takes a shower. I start to wonder how long its been since I last saw her. 3 maybe 4 years, damn. I sit down on the bed forgetting the time only to see out of the corner of my eye my sister come in to the room with a towel wrapped around her and nothing else. It takes me a while to process this until she sits next to me and asks me: "whatchu thinking about?"

"nothing really, was just wondering how long since we last saw each other. I missed you a lot."

As I say this she catches me glancing at her breasts and then snaps her fingers to snap me out of it for good: "hey, my eyes are up here!" Caught, but not fazed I just shrug my shoulders and answer honestly, "sorry, i forgot my manners, but you do have a really great body. i'm only human."

I could sense her relax a bit more now. Flirtatious even. She looks at me, looks down while biting her lower lip and asks: "you really think i have a great body?"

"Stop it. Of course. If we weren't related I'd..."

"You'd what?"

"Never mind..."

"No really, tell me."

I could sense her breathing moving faster, her eyes so focused on me, yet almost like glazed into a completely different world. And it was in this moment that I stopped thinking and just reacted. I leaned forward nuzzling my face right next to her ear to where her long hair was covering half my face. It happened so quick, but I remember saying this words softly, and making sure each syllable was properly emphasized for full effect in her ear:

"I would penetrate you."

SLAP.

I kind of expected that. It was stupid of me to say that.

"the fuck is the matter with you!? we're related!"

"sorry, I don't know what came over me. but I don't regret saying that. I know its a little messed up, but admit it that was kind of kinky."

SLAP

"Ow, ok I deserve that". I had a feeling that she was now playing a little with me. Her slaps were an appropriate response but I could tell she was as flushed as I was.

"look we're both adults and we love each other. I'm not going to tell anyone or let us go do crazy shit that's going to ruin things forever. You can tell me to stop now and we'll forget about this tomorrow. or..."

"or what?"

I leaned in once again nuzzling her ear,

"you can think about me wanting to penetrate you."

She did not move. Nothing. I kept going, my brain had already stopped working and my right hand was now slowly snaking its way up her leg. I kept going by using my other hand to reach her left breast and firmly massage her breasts in a way that would let her know that I too was waiting for a response to see if she was ok with this.

"we shouldn't...."

"I know. Its messed up. But I won't hurt you and you won't hurt me. I can't explain it sis, but right now I can't think of anything else other than having us do to each other the dirtiest, kinkiest things to each other. It's like my mind is going blank and..."

"and what?"

"and here!" I grabbed her right hand and put it right above my boxers on my now throbbing cock. Part of me felt like this was a mistake, like it would snap her out of her trance.

Her hand was initially a little cold to the touch and it just stayed there like she didn't know what to do but the minute I looked into here eyes I knew. And so did she.

Her hand snaked into my boxers and gripped my cock tightly, almost forcefully as she leaned over me now coming to nuzzle her lips next to my ears:

"I just imagined what it would be like for you to come inside of me without a condom. Do you still want to penetrate me?"

That made me lose it. I grabbed her and flipped her on the bed, taking the towel clean off too busy to admire her beautiful body to make sure my own boxers were gone. Soon I was on top of her very close to her entrance and I stopped to look at her once more and kiss her. It was passionate. Her kiss back was not a gentle one, it was rough, it was wet, with an obvious hunger.

"sis, you know that if you..."

"fuck no, you started this - put that goddamn cock inside of me and if you're serious do it hard!"

And so I did. I thrust my throbbing cock into her already wet pussy without abandon and I'll never forget the look on her face of pure shock, surprise, ecstasy.

"fuck. fuck. fuck. oh brother, that feels so good, don't stop. you filthy mother fucker, look at what you're doing to me!"

"and you love it!"

"ung, fuck. I do."

We kept at this for quite a while, neither looking to give up to the other, almost like looking to see who could out-do the other. But we were getting close.

My sister started first: "omg, I'm so close. say something dirty."

ok, I can do that.

"Sis, your brother is about to cum inside of you without a condom. But I won't do it unless you say something to me."

"WHAT!?" almost frantically looking at me.

And so I leaned in closer once again nuzzling her ear and made sure to pronounce this word clearly and softly:

"Incest."

She hesitated for a second still matching my rhythm but gave me that look like she was calling my dare and wrapped her legs and and arms on me putting her lips next to my ear.

"Incest"

And sure enough, almost like if on cue, her legs started to tighten up, her nails started to dig into my back, and her pussy began to clench my throbbing cock. She began to yell: "OMG, you filthy fuck, OMG, I"M CUMMING!!!!!!!!!"

"me too. take it! take my fucking cum sis! fuck i'm cumming inside of you!"

A few minutes passed after we had both blacked out and had come back to reality. My sister was first in turning to me with a mischievous smile and said:

"You know, that was so wrong on so many ways and you really are a pervy fucker, but fuck, its going to come in handy now that I'm moving in to town."