It had been about six months since I began having sex with my sister Sandra and her girlfriend Kelly, when we decided that just getting together for weekends wasn't enough. I was able to sell my place and I moved in with Sandra and Kelly in their house after arranging a transfer with my company. Although all my belongings were stored in the former guest room, for all intents and purposes I was living in the master bedroom with Kelly and Sandra. As a housewarming gift, I bought a big California King bed and we moved it into the master bedroom so the three of us would have more room to play and sleep.
At first I was a little apprehensive about moving in with my sister and her girlfriend as I thought I might be a "third wheel", but nothing could have been further from the truth. We quickly fell into an easy routine where we all shared and shared alike. If Kelly and Sandra were home alone, I knew they were having sex together, and if by chance I were alone with Kelly she and I would be together, and if it were just my older sister and I, the two of us would have some mind-blowing sex. Best of all though was when all three of us were home and we could all pleasure each other, together.
One morning, after I had been living there for about 3 months, I was in the shower with the hot water pulsating on my skin when the door to the shower opened and Kelly stepped in to join me. When she was younger, Kelly had been a gymnast and for long as I had known her she had always had a long, lithe figure, with small breasts, a flat stomach, and a tight ass. That morning after she stepped in the shower, I began washing Kelly's hair and after I grabbed the soap I began to lather her taut body.
Standing behind her I began by washing her shoulders, then I moved my hands down her back, spreading warm, soapy water over every inch of her tanned skin. As I reached her hips I noticed that I could no longer encircle her waist with my hands. I turned Kelly around and it seemed that her breasts had grown a bit as well and were now easily a large B, bordering on a C cup. As I gently squeezed her tits, I joked that Kelly must really only want me around for my cooking since it seemed that she had put on a few pounds since I moved in. Kelly just smiled a sly little smile at me and dropped to her knees in front of me.
Kelly grasped my hardening cock in her left hand, and looked up at me and winked, before taking my rod all the way into her mouth so that my balls were resting on her chin. She kept her eyes fixed on mine as I slowly rocked my hips back and forth, fucking her mouth and sliding my cock down her throat with each thrust. I could feel Kelly's tongue sliding from one side to the other on my cock as the pressure began to build in my balls. I began to thrust my hips faster and I could feel the tip of my cock sliding across the back of her throat as Kelly made gurgling sounds around my dick each time my balls slapped against her chin. Kelly just sucked harder and stroked my cock faster as my orgasm approached.
"Ohh, fuck yeah!" I screamed as my cock sent a shot of man-juice down Kelly's throat.
She milked every drop from my organ, swallowing it all, before she rose from her knees and hugged me tightly as we stood under the shower. The water began to get cooler and we knew the hot water was running out, so we broke our embrace, turned off the water and stepped out of the shower. As I toweled off Kelly's slightly distended belly, I began kissing my way toward her honey pot when she abruptly stopped me and told me that she was late for work, but that we could pick up where we were leaving off later that evening. I thought it was very strange for Kelly to end things so prematurely, but really, what the heck did I care since I'd already gotten my nut that morning. So I wrapped a towel around me and headed to the guest room to pick out my clothes for the day. Kelly closed the door after I walked out, and as I was in my room I could swear I heard some gagging noises coming from the bathroom. I walked back to the bathroom and checked the door but it was locked. I asked Kelly if she was okay, and she said she was fine, she had just taken a drink of water and it had gone down the wrong way but that she was all right. Thinking nothing of it, I got dressed and headed for the office.
When I got home from work that evening, both Sandra and Kelly were waiting for me in the living room. They were both standing at attention with their hands behind their backs, and mischievous smiles on their faces.
"What's going on here?" I asked
In unison they responded "welcome home 'dad'"!
Kelly stepped forward and hugged me and then handed me a cigar she had been hiding behind her back.
"What's this about?" I asked, still pretty confused.
"After that comment you made about me gaining a little weight this morning, I had a talk with your sister and we decided it was time to tell you the truth" said Kelly.
"What are you talking about? What truth?" I stammered.
"You're going to be a father, Dumbass" shot Sandra with a smile.
"Kelly and I had been wanting a child for a while, but of course we couldn't get the job done ourselves alone, so we decided that you were the perfect candidate to help us out. Just before you moved in here Kelly stopped taking her pills, and now she's almost 2 months pregnant" explained Sandra.
I felt as though I had been punched in the stomach. My knees were weak and I felt as though I was about to collapse, as I groped for the couch and took a seat. My mind was running at 1 million miles an hour, thinking of all the possible ramifications. I could not get my brain around the information I had just been given when I noticed Kelly sitting next to me on the couch. She took her my hand and placed it on her belly. Although I didn't feel anything move, I felt something in my soul, and all of a sudden I knew everything would be fine.
"Why didn't you just ask"? I said.
"We were afraid you might say no, and not only would we lose our chance at having a baby, we were also afraid you'd stop fucking our brains out everyday" explained Sandra.
"No chance of that ever happening!" was my response.
Never having been a father before, I had a million questions, but first and foremost in my mind was whether or not I could still fuck Kelly.
"Of course you can" silly, said Sandra.
