Things cooled down after I came in Katie's pussy for the first time. Katie had found a new boyfriend and she was spending a lot of her free time with him although she would still occasionally suck my cock when we were both free. I would often return the favor by sucking her delectable pussy until she was grinding it into my face cumming hard.
Our favorite game would be to tease each other at the dinner table with our parents when we ate together as a family. We would see how much we could get away with with Katie running her foot up my legs and pushing it against my cock forcing me to keep a straight face. But then there would be times she'd be sitting next to me in a dress that I'd be able to slip my hand up it giving her a much harder time to keep a straight face. The game gave us both a rush and while our parents did question us each separately on some strange looks we gave we never got caught and played it off perfectly.
However, it was around this time that I was getting suffocatingly bored with my accounting job. The amount of money it was making me was barely enough to pay off my massive mountain of debt and the monotony was murderous compared to the unbridled high that I felt anytime I would play with Katie or her friend Tara. After one night at work I wanted to fuck hard but Katie was out with her new boyfriend and she wouldn't be home until late. So I decided to go to a bar to see if I could pick up a girl to take home and at the very worst get drunk. It would put me into a little more debt, but I really stopped giving a shit because it seemed like a hopeless goal anyway.
Several drinks in at the bar I spotted this pretty girl with brown hair and above-average sized tits, which is what stood out most to my buzzed sexually overdriven mind. I approached her and complimented her on her outfit, a short black skirt with a tasteful yet revealing top. When I asked her who she was with she pointed with a full drink in hand over to the other end of the bar to a group of girls she must have come with. Asking what brought them out tonight and more about her history peppering her with compliments along the way we were able to talk long enough that she needed another drink so I bought it for her.
I found out her name was Rachel and our conversation began to take on its own natural flow. One drink together turned into two, turned into four and by that point her friends knew to give her her space. As the night grew late we began flirting more overtly and Rachel suggested that we stepped outside to get some more air. We feigned interest in the weather and the surroundings until we were away from the group that hung around the doorway and turned the corner to the side of the building. Over here it was dark, no street lights shined down and it offered an area of privacy in an otherwise public place.
We were talking about something but I noticed she was not releasing her gaze and I held my own and the conversation stalled. That's when I took action and moved in pressing my mouth against hers tasting her tongue. I held her close at her shoulders and her arms slid down to the side of my waist along my hips. She tasted sweet and it made me kiss her harder. I pulled her in closer feeling her big tits press against my body and with the drinks having loosened me up I began to take more control holding her tighter. Her small arms and hands began exploring my body, rubbing my chest and shoulders. My arms moved down and I grabbed her by the waist and then feeling bold I went down further, my hands slipping under her skirt and feeling a pair of lace panties while I gripped her ass. Then suddenly from around the corner we heard her name was being called by one of her friends. Rachel pulled away, looked me longingly in the eyes one last time before forcing herself to snap out of her lust, and said hurriedly that she had to go. Before I could even ask for her number she had disappeared around the corner of the building and she was gone.
That was the final straw. I needed to fuck and Katie was my last resort. By the time I got home it was almost 3AM, the alcohol still holding a serious effect over me. I stumbled through the house, passed my room, and quietly opened the door to Katie's room and listened. After hearing the slow steady breathing of sleep my cock perked up as she had yet to deny me. I walked silently to the edge of her bed and just barely could make out her figure beneath me. I silently unzipped my pants and was able to locate her face with what little night vision I had. Gliding my rock solid cock against her cheek I slide the tip inside of her still sleeping face. I force my way past her relaxed jaw and enter her mouth. Instinctively she began to start sucking the tip even though she was not fully awake- my sister was the perfect slut even when she slept.
As I pushed my erection deeper into her mouth I leaned onto her nightstand to better hold myself steady just as she began waking up. As my hand reached the nightstand it landed in something wet, rubbery, and oddly shaped. Suddenly it dawned on me just as Katie took on her usual cocksucking momentum that made me addicted to her blowjobs when she let out a low moan and pulled my cock from her mouth.
“Mmmm, Mark….” Katie moaned. In my drunken state I didn't realize that Katie had brought her boyfriend home with her and in the darkness I didn't see him in bed with her. And even now she thought Mark had woken up and was ready for another round. My hand had run into their previously used condom. As my eyes adjusted further to darkness I could see Mark's silhouette on the far end of the bed facing the other direction. I took advantage of this moment and grabbed Katie's hair firmly thrusting my cock into the back of her throat. Her eyes suddenly popped open as I looked down at her.
“Do I look like Mark?” I whisper quietly but firmly. Katie swallows deeply which she knows I enjoy when I'm in her throat. As I begin to fuck her face harder releasing all of my unquenched frustration given to me by the mysterious Rachel I shift my arms position on her nightstand and suddenly multiple bottles clank into each other with some crashing to the floor. I freeze in mid thrust. Even in the darkness I can see Katie's eyes bug wide and then shift to the other side of the bed, my cock still in her mouth. Mark shifts slightly but then is silent. They had been drinking too and it was unlikely Mark was going to wake up easily, especially after Katie had worn him out. Knowing the depth of his sleep gave me an insidious idea and suddenly I pulled out of Katie's mouth bending down low to her ear.
“Turn around, spoon Mark. Get right up close to him so I have room,” I whisper. Slowly and deliberately Katie begins to move, leaving me enough space on the other side of her for me to slip in under the covers. As she does I undress so I'm completely naked. As I slide under the covers I find she still is as well making me certain Mark was as well. If only Mark knew what a little slut I knew his girlfriend to be. Although Katie and I had only fucked for the first time the previous week it was something I was craving so badly now and with both of us still filled with alcohol neither was going to let mere logic ruin the night.
I caressed her body underneath the blankets as she poked out her ass for me so I could find her pussy – of course it's already (still?) soaked. I chuckled to myself that while her boyfriend was forced to wear a condom she let her own brother enter her without. I hooked her mouth with my fingers as I started fucking her deeper and harder. Since we were both on our side like a sleeping position so she could cover the view of my body if Mark were to wake up it made fucking awkward and the whole mattress started to move. But with how much I had been teased that night I just didn't care. I needed to cum and that's what my sister the cumslut was for (she wore the title proudly).
As I dug my cock in deeper with the bed moving and Mark still miraculously sleeping I grabbed the used condom from the side of the bed and put the base of it to her mouth and told her to drink. And while I held the condom I felt her tongue begin exploring for the opening just as she did when she was tongue-fucking Tara the previous week. Once she found the hole she lapped up Mark's cold cum right out of the condom before I lifted it up letting it drip all over her face.
It was disgusting yet primal and immediately it made me cum. And without thinking I came into my sister's unprotected pussy for the second time in two weeks. Katie only moaned quietly as the last of the cum drizzled over her face. That's when Mark woke up. Still in a drunken stupor he managed to ask what the matter was while bending his head back with his neck.
“Nothing,” whispered Katie widening her shoulders to hide me from his view, “go back to sleep,” she said softly as she kissed his mouth briefly still covered in his own cum.
Source: reddit.com/r/sexystories/comments/36kpp0/secrets_after_midnight_mf_inc_cheating