I was just coming home from work and on my front step I saw my sister Lee sitting there - crying her eyes out. I ran over and asked what was the matter, and she told me that her boyfriend had broken up with her and it really hurt. I put my arm around her and asked her to come inside so we could talk. She got up, then we both went inside.

I said, "let's not spoil dinner... let's just eat and drink and laugh a little. I'd already ordered Chinese and although my sister was only 18, I opened a beer for her, figuring 'what the heck' since I knew she was upset. As it was, our mom and dad were out of town for a week on vacation and I was in charge anyway. She took the beer, hesitating at first (she'd never drank... in front of her big brother anyway), but eventually, she'd downed that one and asked for another, which I supplied.

After more than a few beers in us before the food arrived, we ended up just nibbling on the stuff the delivery guy brought, and went on the couch and talked while we watched a video.

I accidentally put in an old porno video in and it'd started before I had a chance to realize what it was, and when my sister saw it she laughed and spit the mouthful of beer at me by accident, saying, "Wow! So THAT'S what you do when I'm not around!"

Embarrassed, I pulled the tape out and apologized. She said, "Oh that's ok... I like porn anyway... it gets me hot."

I said, "Geez sis... don't tell me that - you never know WHAT that kind of talk will make me start be thinking next!" I was joking when I said it, but to be honest, I couldn't help noticing how good she looked... petite, built nice, very sexy lips... if she wasn't my sister - wait... WHAT WAS I THINKING?

Time to change the subject.

She must have seen me squirm a little, because she "pushed the point" and said, "Don't tell me your 'little sis' is helping you think bad thoughts, huh?" While I struggled to behave myself and clear the thoughts that were starting to take over out of my mind, she came over to me and leaned forward, putting both her face only inches to mine and putting a great view down her shirt within eyesight.

She said, "It's ok... I knew you were checking me out on occasion. I've seen you looking when I'd get out of the shower. It's cool and I won't say anything. To be honest, I watched you jerk off once through the crack in the door of your bedroom." "You what? I can't believe..." Then suddenly I thought to myself, 'Wait... if we keep talking like this, what's next? Are we just gonna forget we're brother and sister and do it like we weren't related.' "You know big bro... and from what I saw, you ARE my BIG bro... I'll make you a deal. I'm just drunk enough to say yes if you're drunk enough to let me, and I'm horny enough to suck your cock dry if you're horny enough let me." WOW! I couldn't believe I was hearing this! I went from helping my sis through some depressing stuff to actually contemplating eating her (in my mind) juicy pussy as I finger fucked her until she let me cum in her mouth. I got a little scared of what I was thinking and started to walk out of the room, but she turned me around and kissed me on the lips... a nice, sensual one.

"It's up to you, but I love you either way," she said.

Unable to resist her any longer I pulled her back to me and kissed her in a way that had NOTHING to do with anything brotherly. I started to kiss down her neck as she reached into my shorts and started to stroke my now ragingly hard cock.

My sister took my pre-cum and rubbed it on her lips, making them glossy and turning me on like you wouldn't believe! I said the hell with hesitation and ripped her blouse off and literally pulled her out of her bra and started to suck on her nipples, easy at first but then harder and harder as she pressed them further into my eager mouth.

She responded as if I had done the best thing I could and she literally threw me on the floor and pulled my shorts down and turned around straddling my face while she took my entire cock into her mouth in one swallow, at the same time she was pulling her own shorts and thong panties down.

I couldn't resist the hot, wet musky smell of her pulsating and glistening pussy, and with no hesitation what so ever, I thrust my tongue as deep into her as I could as she sucked on my cock like a million dollar whore.

After making enough slurping noises to wake the entire planet and us seemingly having a contest to see who would make the other cum first, I found that I couldn't hold back any longer. As she gently scraped my cock against her teeth and tongued and deep-throated me, she whipped her pussy out of the way to prevent me from making her cum first. I shot spurt after spurt down her throat, groaning in ecstasy as she made sure to suck every drop of cum out of me.

While all this was happening, a big surprise awaited both of us.

My Great Dane (Apache) snuck up behind my sister and new love/sex object and started to lick her pussy. She started to move in shock but I held her lips on my cock and wouldn't let go.

After a few seconds of sucking me off and being licked, she stopped resisting and started to push back towards Apache's tongue, letting it go inside her - a first for her (and for me to be honest).

Then suddenly Apache leaped up and BAM!!! He jammed his entire 12-inches of doggie cock into my rather petite little sisters cunt. She let go of my cock and SCREAMED in shock and pain, and maybe a little lust. When I saw what was happening I started to stop everything and help her, but after a few quick thrusts I could tell that she was DEFINITELY into it.

In the process of all of this, I was getting SERIOUSLY turned on and started to crawl underneath her belly and lick her clit as the dog fucked her with a foot long pole. I knew that dogs get a "knot" that holds the cock in a female dog after it cums and didn't know if it would hurt my sis, but she didn't care as long as the cock fucked her, so I ate her with the dog cock in her and reached around and fingered her asshole.

THAT drove her over the edge and she came like her life depended on it!!! She had already gotten me hard again and was sucking my cock as she came... her clit literally swollen with blood and her pussy leaking cum (hers) like a river. I couldn't stand it myself and when she finished cumming, I pulled the dog off, jerking it off for a few seconds to keep it hard, then laid down on the bed and pulled her on top of me, her back to my front and slid my cock into her asshole.

Then to my amazement my sister pulled the dog back to her pussy, facing the dog this time and then started to fuck it again as I fucked her in the asshole.

THIS TIME, there was no stopping that knot, as I literally felt it through the wall separating her pussy and asshole. It was so big and hard, it actually made my cock hurt, but hurt REAL GOOD, knowing what I was doing, where my cock was and WHO I was in! MY LITTLE SISTER! THIS WAS AMAZING!

Right about then, the dog started to cum, and man... what a lot of cum! I almost felt her pussy swell with cum in it, and it drove ME over the edge and I started to cum... which drove HER over the edge and SHE started to cum... The three of us - all cumming as if our lives depended on it! Amazing! After a few minutes of the most intense orgasm she or I had EVER experienced, I started to lick the cum out of her asshole and pussy as she started to suck my cock clean. That's when Apache licked her face, then licked my cock clean at the same time, and when my little sis decided to pay Apache back for the best sexual experience ever and sucked his huge pink cock clean and dry... not caring what anyone would think.

THAT was the first of what would become many, many days of sex between sis, Apache and I.