I came home early from work to take my wife to a new upscale restaurant in town, which is impossible to get into if you don't get there when they first open. My sister-in-law, Emily, was over to visit. No one was around when I walked in, and I figured they were upstairs in my wife's craft room. I went upstairs to get changed for dinner. What I heard as I approached the top of the stairs wasn't their normal banter. It was more of unholy moans and wails of raw, passionate sex.

"I'm almost there. Fuck me faster. Harder!" Em wailed from our bedroom.

I'd never heard these words come out of my sister-in-law's mouth. Em was a shrew—plain and simple. She and her husband were staunch churchgoers who cowered and covered their ears at the mere mention of anything remotely sexual. Em's the total opposite of my wife, who's open to anything, including anal and the fourth hole. So you can imagine my shock when I peeked through the cracked door to see my wife railing my sister-in-law with a ten-inch strap-on doggie-style.

"Bitch, hurry up and cum so you can eat my cunt," My wife growled as she pounded the dildo into her sister's pussy.

"Holy shit. What was I listening to?" I thought as I peeked through the crack in the door. There was my wife, Sara, gripping Em's jiggly hips while she pounded the black ten-inch dildo into her sister's cunt. Every thrust sent ripples through Emily's backside. Meanwhile, Em was on her knees, holding herself up with one arm while she pinched, pulled, and rolled one of her nipples. She had it stretched so far that I thought she'd pull it off her tit.

"That's it! Keep pounding my pussy. Fa. Fuck! FUCK ME!" Em screeched. "Ahhh. I'm cumming, Sara. Don't stop. Keep going." There were a few more thuds of Sara's hips slamming against Em's backside, and Em squealed again that she was still cumming. Em finally collapsed forward and rolled onto her back so Sara could sit on her face.

My wife looked like she was T-bagging her sister as she straddled Em's face. Sara unbuckled the contraption from her waist and pulled the dildo out. Leaning forward over Em's body, Sara shoved the silicone shaft back into her sister's pussy, thrusting it in and out rapidly.

Em's muffled moans emanated from my wife's muff as Sara pushed her sister into orgasm overload. Sara could be that way___she'd often keep sucking my cock until she'd get a second and sometimes a third load out of my balls. In this case, it was her baby sister who was on the receiving end of her seditious sex drive. Sara lowered herself onto Em's body, licking her clit while driving the dildo into her sister's pussy, all while grinding herself to climax on Em's tongue.

Their moans increased in pitch as well as urgency as they both grew closer to another series of orgasms. "Shove this in me, Em!" Sara said loud enough for Em to hear as they sixty-nined. Em took the dildo and plunged it into my wife. I could tell it went into her ass by the way she squealed. Sara loved having something in her ass while someone ate her cunt.

I contemplated my next move while I watched. Should I walk in and try to join the two of them, or jack off, watching their erotic interlude? Part of me thought that I'd wreck their vibe if I interrupted. "There was no way that Em would cheat on her husband," I thought. But up until a few minutes ago, I couldn't have imagined what I was witnessing was possible either. I took the chance and walked into the room, trying to act surprised. "What the actual fuck is going on here?" I said, pulling out my cell phone to click a picture of their shocked expressions.

"Wha...what are you doing home?" Sara stammered as she climbed off Em's face.

"I'm about to join in, that's what I'm doing at home," I said, dropping my pants and pulling off my shirt.

"Whatever. Just don't tell Mike. He won't be able to handle this," Emily replied. Em's husband, Mike, was more uptight than she was. The boy definitely had a stick up his ass. There was no way he'd stay with Emily if he found out she swung both ways.

I, on the other hand, was open to the possibilities, including fucking my sister-in-law, and from the glint in my wife's eye, she was thinking the same thing. Sara had always wanted to have a threesome. She'd often fantasize about being fucked by multiple partners. I would end up thrusting a couple of dildos into her while she sucked me off to give her the thrill of a gang bang.

"Well, get after it," Sara told me as she spread her legs on the bed.

"No, I'm going to give this one a try," I said, pushing gently on Em's shoulders until she was prone on the mattress.

Em's chin quivered as she looked into Sara's eyes, searching for her permission. "Go ahead. You're both going to love this," Sara said as she started to finger herself. Emily spread her legs and pulled me on top of her. We kissed. Just a peck at first, but as my weight settled onto her, she parted her lips, welcoming my tongue. She kissed back with fervent passion. Em's tongue danced around mine in a long, lingering kiss.

Emily's tits have been the object of my desire for as long as I've known her. They haven't been manhandled, and have less mileage than my her older sister's. I leaned over, sucking one of her nipples between my lips as I sank my cock into her vagina. Em's breasts weren't the only thing with fewer miles. Her vagina was tighter as well—no doubt from lack of use. A satisfying moan emanated from her very soul when the tip of my cock pushed up against her cervix. I pulled out an inch or so and shoved it back in so she would remember its size.

Sara sat, fingering herself fiercely, while she watched me fuck her little sister. Feeling left out, she leaned in and sucked Em's other nipple as the thrust three fingers up her slut hole.

Em, overwhelmed by the erotic pleasure surging through her body, could hardly contain herself. "Uh, gaaahd," she groaned. "I never knew sex could be so much fun."

"Is there something that you'd like to try? Something that you've been afraid to ask Mike to do? Something that would stay between the three of us?" Sara asked, trying to coerce a response from her baby sister. "You're safe here with us. No one would ever know."

"Uh, Um. I've never been on top before."

"Would you like to try. Do you want to ride Bobby's big cock?"

"Uh, huh. Could I?"

"Anything you want, honey."

Sara had me get in the center of our bed. She then had Emily straddle me for reverse cowgirl. She held my cock, guiding it to Emily's cunt hole as Em lowered herself onto my cock. Em placed her hands on my knees as she began to rock her hips, slowly increasing the length of her strokes on my shaft.

Her first orgasm hit quickly, causing her vigina to tremble on my cock, as it spasmed around my shaft. Em rode me through a few more orgasms, but said it wasn't building the way that she thought it would. "Here, honey. Lean back and put your hands on Bob's shoulders." My wife guided her sister into position over me. From this angle, I was able to reach up and grab Emily's breasts while she slid up and down on my shaft.

Emily was still struggling to get the hang of it when Sara lay between both of our legs. "Let's see how you like this," Sara giggled as she ran her tongue over Em's clitoris. I felt my wife's tongue flickering across Em's pussy lips, teasing her clit, and then down my exposed shaft to my balls, which got Em's juices flowing. Em started humping Sara's mouth, and my shaft simultaneously.

A mixture of Sara's saliva and Emily's cooch juice coated my balls. Sara sucked my balls into her mouth, slurping off the excess. The sensation, combined with Emily's tight pussy felt exquisite. I started thrusting my hips upward, driving my cock deeper into my sister-in-law's honey hole, making her moan in ecstasy. "Oh yeah. Keep going. Keep going. You're gonna make me cum again!" Emily muttered breathlessly as she grabbed my wife's head and mashed it into her cunt.

It was enough to make me as well. Sara's flickering tongue and Em's spasming slit pushed me over the top. I began to spew my steamy spunk into Emmly's pussy. My balls clenched, unleashing countless squirts of cum into Em's cunt, filling it to overflowing.

Sara felt my nuts tighten and licked up the excess as it oozed out of her sister's pussy. She kept licking my balls and the base of my shaft, trying to coax out every drop of cum for her to lap up. Sara was adorned with a creamy cum stash when she finally raised her head. "You better get this hard again, cuz it's my turn now," she said, sucking my shriveling dick into her mouth. I asked what she had in mind. "It's a surprise, but it involves this," she said, picking up the strap-on dildo and taking it to the bathroom.

Sara returned a couple of minutes later after washing off and reassembling the sextoy. She tossed it to her sister and told her to put it on. My balls tingled with anticipation, as I had an inkling of where she was going. Sara wanted to be double penetrated. Fucked by two men was her biggest fantasy, but she was too scared to act on it until now.

Sara straddled her sister, impaling herself with the big black dildo. I stroked my cock while I watched from the sidelines until I was called for duty. I had no trouble keeping it up as I watched the sisters go at it. Sara was humping what I could only describe as the Mama Pleaser 2000 while she and her sister made out. Sara's lust-filled eyes locked onto mine. "Climb on, big boy."

I got on my knees behind her and wedged the head of my cock into her pussy. "Ffffuck," Sara groaned as my cock sank further into her pussy. Em and I only took a few strokes before Sara said she couldn't take the two of us in her cunt. "Put it in my ass, Bobby." I was bad boy Bobby whenever we were about to do something taboo, like anal.

My cock was already lubed enough from Sara's pussy that my cock slipped right in when I pressed the tip of my cock against her pucker. Sara's already tight ass was exponentially tighter with the big black dildo in her cunt. Sara rode Em's strap-on while I pummeled her pooper for a good ten minutes, until she screamed that she couldn't take it anymore.

Sara collapsed on top of her sister, twitching, while a huge climax ravaged her senses. I stood over them, stroking my cock and showering them with streams of warm, gooey cum. I left the sisters writhing against each other on the bed while I watched proudly, knowing that I'd satisfied them both.