Author's Note: While this is an incest story this also has a gay component so if this offends you, you are warned.
*
It was early spring, my Wife and I got a couple days off from work and we decided to head out to Las Vegas, NV for a well-deserved vacation.
My sister and her husband live not too far from Vegas and so I called her and let her know we were headed in their direction and they both jumped at the opportunity to skip out from work and meet us there.
Perhaps I should take a moment to describe all of us...
My wife's family moved up to California from Mexico back in the 1940's and my wife and I met in college here in New York. I was hot for her the moment I saw her, with dark brown skin, large brown eyes, long straight black hair to her waist...
It took me the better part of her freshman year to convince her to give me a chance, she was there to study and didn't want the distraction, but since then we've never been anything but completely in love.
My sister on the other hand went out west after high school and met up with her 'cowboy'. Dave is about 6'2, bond hair, and in good shape, you have to be to ride the rodeo circuit the way he does when he can. The rest of the time he either works construction or as a landscaper.
My sister and I are cut from different sides of the same cloth; there is no way we could be mistaken for not being related.
Both of us have blue eyes, a light boned build, and medium brown hair. My sister is just a few inches short and fifty pounds lighter, with her hair around her shoulders but otherwise she's the hotter, more female version of me, and I'm the 'dorky, but cute' male version of her.
I'm 5'8 160 pounds, I work a desk job so I'm not 'in shape' but I have managed to keep myself from getting over weight. My wife's friends have been know to describe me as good looking but not hot so don't expect me on any 'stud' calendars.
I'd decided that this trip my wife and I were going to splurge a bit so we got ourselves a full sized suite with an in room hot tub and a view of the strip.
My wife Monica and I got there a day ahead of my sister Jenny and her husband so we had the chance to get settled in, wander around a bit, and do some early drinking and gambling.
Jenny and Dave met us down in the casino of our hotel after they'd gotten themselves settled in theirs.
I was at the black jack table when I felt arms wrap around my neck and kiss on my cheek.
"Hey there Mikey!" My sister said excitedly.
"Hey there little sis." I answered as I finished the current hand, collected my chips and got up.
"Hey Mike." Dave said reaching out his hand which I took in my mine with a quick hand shake.
"Where's Monica?" Jenny asked.
"She's working some slots over there, last I saw." I pointed in a general direction.
The three of us made our way through the casino to where my wife was sitting. She looked up and smiled a huge smile and got up to give my sister and Dave a big hug.
"Drinks are on us tonight." Monica announced proudly.
"You do well honey?" I asked.
"Up $350, you?"
"Up $2.50." I answered with a grin.
"You suck." She said sticking her tongue out at me a playful manner that came out in her only when we were able to really get away from the grind.
"So where to now?" I asked.
"Let's just sit at the slots and get free drinks!" My sister said with a smile and a laugh.
We all thought this a great idea so we each take a slot of our choice and begin plugging in dollars and pushing buttons.
My technique is to accept I'm not going to win, because I never win, so I try to lose at a slow enough rate to get as many free drinks as possible. My sister, wife, and Dave all expect to win and bid big either frequently or constantly. Somehow it seems to pay off a bit for them.
2 -- 3 hours of this and we've downed several drinks each and have each had enough sitting in front of the electronic screens. So we begin wandering the strip to look at the sights, exploring the various casinos, and grabbing drinks as we go.
"So where are you guys staying?" My sister asked.
"We're at the Luxor." I answered.
"We've got a suite with a hot tub looking right out of the corner of the Pyramid!" My wife added excitedly.
"Too cool!" My sister responded.
"Someone is splurging." Dave added with a laugh.
"Hey its our vacation and we're gonna damn well enjoy ourselves." I said with a bit of defensiveness.
"Besides it was free upgrade thingy." My wife interjected. "Wanna come up and see it?"
"Yeah!" My sister said quickly. "Got any booze up there?"
"Nah, just got in today." I said with a shrug.
"Then we'll stop by a liquor store on our way." Dave volunteered.
We continued our way back up the strip towards our hotel and continued chattering along the way. When we reached a liquor store Dave and I went in to make the purchases while the girls waited outside just watching the lights of the strip and talking girl things.
Once the purchases were made we finished making the trip up to our room. As I made drinks for everyone my wife gave the 'grand tour' of the two bedroom suite.
"Hey you wanna go in the hot tub, sip drinks, and look out on the strip?" Monica asked.
"Honey?" I asked uncertain.
"We don't exactly have swim trunks." Dave added.
" Oh don't be a big baby." Jenny said as she pulled her shirt off to accent the point.
Dave and I looked at each other and shrugged so I began drawing the bath as everyone else stripped and then my wife added various ingredients to the bath while I stripped like the others.
The four of us climbed into the tub and resumed conversation while enjoying the drinks and the view.
I've always loved the way my wife looks naked and in particular there is something especially erotic about seeing her in the bath that arouses me every time.
Of course now there was the added complication of being in a bath with my sister and my brother-in-law. I was trying very hard not to stare at my sister's tits just covered by bubbles, but I also couldn't help but notice my brother-in-law checking out my wife.
I've never had a threesome let alone a more-some, and I've never done anything with another guy present, and I've never even considered my sister in a sexual context before but that night it was getting hard not to think about such things.
I then began to notice the tub sloshing a little bit back and forth. It took a moment to discover the source of water motion, but it was soon obvious.
My sister's eyes were glued on my wife's face whose eyes were closed. My wife was nearly imperceptibly moving back and forth and I was certain that if I looked under the water I would see my sister's fingers playing with my wife's pussy.
That thought took my semi-hard cock to instant full rigidity and nearly caused my eyes to pop out of my head and splash into the tub.
I began to lightly stroke my manhood beneath the water as my eyes remain glued on my wife and sister. Slowly my wife's movements became more exaggerated, her breathing became deeper, and faster as she quickly reached climax with my sister's ministrations.
Slowly Monica's movements slowed as she came down from her high and that is when my sister seemed to notice that both Dave and I were staring at them.
"I think you gave us away." My sister whispered with a smile.
"Couldn't help it, felt so good, Jen!" My wife said, her eyes still blissfully closed.
"Well then you won't mind returning favor for favor." My sister said with a bigger grin as she got up on the edge of the tub and grabbed my wife's hair and pulled her face to her clean shaven pussy.
I watched in shock as I witness for the first time my wife licking the pussy of another woman. Never mind it was my sister, and I almost blew my load right then as my wife began to devour my sister's juices. Jenny locked eyes for a moment with me and I knew she knew I was stroking my meat beneath the water.
My sister's eyes half close as she pulled my wife's face tighter to her pussy even as she lifted her hips up to fuck my wife's face.
I could hear my wife's muffled moans of encouragement as she continued to use her tongue to encourage Jenny's oncoming orgasm.
Suddenly my sister threw back her head and screamed loud enough to nearly shatter every bit of glass in the entire hotel as her orgasm hit her and she came into my wife's eager mouth.
Slowly Jenny returned to reality and she opened her eyes with a knowing smile in both mine and Dave's direction and I looked over to see that he too was stroking his cock beneath the water.
Jenny then directed her smile at me and I flush a little embarrassed to be caught so aroused in the presence of my sister.
"You liked seeing your little sister cum?" She asked coyly staring down into the water at my rigid meat still grasped firmly in my hand.
All I could do is nod and get out a stuttered affirmative.