Hiya! So this past few days have been crazy at work, having to pull off double shifts and overnights, for both my gf and myself, making it almost impossible to find time to do anything together, including sleep.

Her sister, on the other hand, has been apparently egging my gf about having more "time with us" because she's "bored and interested". Take that as you will, I know how I interpreted that.

So, my gf has been telling me the past few days how she's starting to get sorta annoyed by her sister, by how she's always pushing for more "interaction" and about how she never does any chores around. I jokingly said that perhaps we should take today, given the fact that it's Friday and we both have the entire weekend off, to put her in place. I half expected her to laugh and say how we should leave all that in the past, so I was pleasantly surprised when my gfs eyes grew wide and I saw her teasing smile grow as she said: "yes, perhaps we should".

My gf left the room, I went to play some COD (managed to finally break lifetime K/D to a positive ratio, 1.1 for those interested; I know I suck) and thought nothing of it. Amy finished watching some movie on her laptop and went to get a shower. My gf, still nowhere to be found, texted me to meet her in our room, so I did, figuring I was about to get lucky in the shower again.

I was, however, about to have my mind blown to bits.

I entered the room and was greeted by my gf, wearing a skin tight black corset and nothing else, laying in bed, one leg over the other, her back turned toward me so that I could appreciate the perfect curvature her ass made against the darkness of the room, illuminated only by a nightlamp which she was facing.

I walked a few steps forward and I heard her voice teasingly say, without turning around: Amy has been impatient.

I crawled into bed and made my way towards my gf, only to be greated by Amy, lying next to my gf, bare body exposed, arms by her side, blindfolded by a black silk cloth my gf and I had lying around (because of reasons, ya know.) I was taken aback for a second, but quickly regained my composture and asked: Well, what should we do about it?

"Well you could teach her a lesson; no hands on from me, remember?" Replied my gf as I began to kiss her neck and caress every inch of her body, pressing tight against her.

"Perhaps" I said, gaining confidence, "or perhaps I could start with you". And with that, in a swift motion, I moved my left hand towards her pussy, gently brushing my fingertips against her already wet lips, as I enveloped her neck with my right arm, using my hand to muffle the yelp she let out.

I began to softly tease her pussy as I kept her mouth closed and pressed my body against her. I felt her twitch and beg for more by pressing her body deep into my hand, before I knew it I was fingering her with two fingers. This went on for a while until I decided she needed better treatment, so in a single motion I let go of her, turned her around so that her face was against the mattress, and lifted her hips slightly.

I quickly position myself behind her and took no mercy nor warning before I shoved my face into her perfect ass, making sure to stick my tongue directly into her asshole. She helped, twisted, moaned, and began to quiver as I ate her without any consideration. I felt her align her hips so that they where in line with my face, and I felt her desperately try to play with her pussy as she was getting eaten; so I decided to help by begging to tease her pussy myself.

She began to moan louder and louder, until she let out a single, loud, unshaken and undeterred "fuck yes" causing her to explode; collapsing on the mattress, her face turned towards her sister, Amy, who was still right where we left her, except her mouth was slightly ajar, one of her hands was busy with her nipple and her other hand was busy with her pussy.

My gf, still panting, begged me "please, let me have it". I, however, wasn't giving easy. I told her to turn around, which she promptly did. She crunched towards me and began to remove my pants as I took off my shirt. Once I was done I instructed her to lay down as I finished removing my pants. I then began to make my way towards her, kissing every single inch of her body, and making sure to give special attention to her perky breasts, whose nipples stood at full attention. Once I got to her neck, I made my way towards her ear and whispered, loud enough so that Amy, whose head was right next to my gfs, could hear: I'm going to take care of an issue first.

I saddled Amy right over her neck, my knees to either side of her, so that my penis stood right over her lips. I then told her to open wide, which she did without any further questioning, and placed my hand in the back of her head. I gently nudged her head forward and she quickly ran into the tip of my dick. She began to lick and kiss it while I held her head. I turned around and saw my gf, eyes fixed on us, her body turned towards me, one of her hands playing with herself as the other helped support her.

I began to accelerate Amys pace with my hand, but the position and her inexperience caused her to have to pull away frequently, or have her teeth grind against my dick. So, I pushed her down and instructed for her to turn around. She did, without questioning once again, so that her tiny little bottoms where facing upwards, right behind me.

I re positioned myself so that I was now right above Amy's knees, and made my way towards her exposed bottoms. As I did, I used my hands to slightly open her up, being greated by her pluckered little asshole. As I did for her sister, I shoved right into it, having no mercy. Amy let out a shuffled moan and began to move her legs erratically, until eventually she settled down and her moans became more tuned, I could tell she was enjoying herself.

I gave Amy a quick slap, causing her to let out a yelp, and lifted my head slightly, where I was greeted by my gf, in absolute bliss, her knees slightly bent, her left hand pleasuring herself as her right one worked her nipples, eyes shut in absolute concentration.

I broke said concentration by asking her to get out a condom, before returning my attention to her sister. I spread out her legs a bit wider, and gently propped up her hips so that I was now presented by her perfect pink pussy lips. I was transfixed on them, toying in circles with my tongue around them as I used my hands to pinch and slap Amy's ass, when my concentration was broken by my gf, who had assumed a position on her knees right next to myself, so that she was only inches away from her sisters ass, presenting me with an opened condom.

I shoved Amy down, slightly turned my body so that my erect penis was staring straight at my gf, and instructed for her to put it on. She did swiftly, and, with a kiss on the tip of my penis, assumed a position once again on her knees.

I stepped down from the bed and pulled Amy towards me, so that she was standing on her tiptoes, her body bend at her hips, facing downwards towards the mattress, her head slightly turned towards her sister.

I licked my thumb and began to tease her asshole, causing her to moan and causing my gf to try to reposition herself. She ended up settling for laying down, her head next to Amy's, her knees bent.

I continued to tease Amy's asshole and once I felt it begin to pulsate, I took the opportunity to stick a bit of my thumb in, while shoving the entire length of my dick on her pussy in a single motion, causing her to let out a loud cry and move forward. I quickly grabbed her hip with one hand and pulled her towards me, marking the rythm as I fucked her while still pushing, each thrust a bit more, on her asshole.

I felt Amy twitch, her pussy grow wetter, and her asshole spread wider and wider with each thrust. By now she had no worries nor reservations, her moans became loud and erratic, often I saw her back arch as her face lunged towards the sky letting out loud moans, before collapsing on the mattress, where we kept on going.

This went on for a while, until I felt as if I was close to cumming. Not wanting it to be over yet, I gave Amy a final, long, deep, thrust, making her scream in pain and collapse forwards.

I quickly exited her and instructed my gf to get me another condom. I took mine out as she got on her knees next to me and put on a new one. She tried to give me a blowjob but I just couldn't take it, I had to be inside her, so I lifted her head up and told her to take position next to Amy. She did, obediently, and even helped guide my penis into her pussy.

Things quickly became animalistic, I was thrusting her with all my might, she was moaning and thrusting backwards, as both of us fought for a place in her asshole. Eventually, in one of said thrusts, I exited her and placed the tip of my penis on the entrance of her asshole. She grabbed a hold of my shaft with her left hand, and gently but surely trusted her hips backwards, causing me to penetrate her; and causing her, in turn, to let out a moan.

We began fucking, slowly at first, but eventually we got back into a faster rhythm. I began slapping my gfs ass as she toyed with her pussy. This went on for a while until I felt her twitch and moan, collapsing forwards with myself still inside her asshole. Panting, she softly and slowly removed her hand from her pussy and made her way towards her head. She turned her face around so as to face me, looked straight into my eyes, and began licking her own juices off her fingers.

I lost it there, thrusting myself forwards causing her to let out a loud yelp.

Amy, who had by now removed her blindfolds, was now in bed vigorously touching herself. I turned to her and instructed she came and knelt near me.

She swiftly exited the bed and assumed her position right to my left side, kneeling a few inches away from her sisters asshole, which I was still gently fucking. I, however, grew in confidence and slightly spread my legs. I told Amy to get between them, facing me.

She looked me in the eyes with hesitation, but I was not having it. I exited my gf, causing her to yelp and moan, and removed the condom. I grabbed Amy by her shoulders and positioned her so that her head was resting on the border of the mattress. I moved her sisters legs a bit more apart causing her pussy to fall a few inches, barely above her sisters face, and made my way into my gf. As I did, I gently shoved Amy's head forward so that she began licking and playing with my balls on each thrust. Eventually, she grew more competent, and began licking my shaft as I made my way inside and out of her sisters pussy, even as my movements grew faster and more erratic. I heard my gf moan louder and louder, saying how much she wanted to cum, and with that I began to hear Amy, who was now an expert and even touching herself at the same time, muffle her moans as she took in my balls and shaft.

I felt as if I was about to cum so I gave a few strong thrusts into my gf, a hard slap, and caused her to collapse forward screaming in a joyous ecstasy. In the same movement, I thrusted back and aimed my dick at Amy.

I caught her offguard with the first blast to her face, causing her to whimper and even try to more her head, but imminently she caught her barrings and opened her mouth as she turned her gaze upwards to me, looking at me with those wide eyes, causing me to pump a second, third, and fourth load into her face. She closed her eyes and smiled. Then, as her sister had once done, she used her finger to wipe a bit off her face and, while staring at me, licked it off.

She remarked, once again, how she didn't find it disgusting as she made her way towards the bathroom to clean up. My gf, who was barely catching her bearings by now, remarked from bed "serves you right, at least if you don't clean you can swallow the next one" to which we all laughed.

We then proceeded to take a shower, like a proper shower where nothing erotic happened, and jumped into bed for a movie on our laptop.

Technically, they still haven't done anything with each other, however the boundaries are becoming more and more blurred and neither seem to mind, so I'm holding onto hope. If not, however, with our current arrangement I still consider myself a lucky bastard.