As I looked down at my little sister and saw my cock buried deep inside her, pulsating, and sending spurt after spurt of cum deep into her, I was overcome with the unreality of it all. She was an incredibly beautiful woman. At only eighteen years old, her perfect skin was soft and tight. She was still tanned from the summer and I noticed her bikini tan lines. She had changed so much over the last year, with the pregnancy, but she was still the same amazing girl that I had grown up with. She was strong and smart and unbelievably sexy. Looking down on her back as she continued to buck against my hips and listening to her softly moaning, I felt the last cum drain out of me.
Slowly we stopped moving and I just knelt behind her, enjoying the feeling of being inside her, fully drained and satisfied. My hand caressed her round ass cheeks and then I traced my finger down her crack until it found her tight little asshole. I playfully pressed and rubbed against it, feeling her muscles contract, squeezing and puckering the little hole. I reached down and took hold of her cheeks more firmly, feeling the plump flesh resist as I squeezed. Pressing my thumbs against the inner sides of her butt I spread her cheeks wide, fully exposing her asshole, and her pussy, which was tightly wrapped around the shaft of my cock. Slick fluid was running down both of our thighs and I could feel her thick blonde hair, damp and pressed against my inner thighs. It squelched every time I pressed against her.
As I held her ass open, I pressed my right thumb against her tight hole. She relaxed and allowed the tip of my thumb to enter her, then squeezed hard. As she did I felt my cock begin to come alive again, twitching and beginning to grow harder. She felt it too and bore down on my cock. I pressed my thumb deeper into her and heard her moan louder. With my other hand I let go of her ass, reached forward, and took her hair in my hand, gathering in up into a loose ponytail and gently pulling her head back. The sight of my sister in front on me on all fours, back arched, moaning with pleasure as I teased her asshole and pulled her hair was all I needed. I was now fully hard again and began slamming my cock into her again, harder this time than before. She responded with louder moans and wiggled around, creating even more friction on our genitals.
I pulled back on her ponytail and drove my cock deeper into her soaking we pussy. Her pubic hair was drenched and I could feel it dripping every time it was crushed against my body. She drove her body back into mine with forcefully in perfect rhythm with my thrusts. She was now squirting again. Every time I plunged my cock into her, I could feel the hot, pulsing streams gushing out. I finally let go of her hair and dropped my hands to the small of her back, feeling her smooth skin, slightly damp with sweat. I ran my hands up along her spine as I continued slamming into her. The motions were much faster and almost violent now and she was moaning so loudly that I hoped no one was passing by on the street outside. I couldn't contain myself for a second longer. I reached out and took hold of her shoulders as my body was racked with another powerful orgasm. I wasn't sure how much cum I had left at this point, but she was getting every drop. We stayed in that position for several minutes, breathing hard. Lindsey dropper her head to the bed and I slowly pulled out and came of her and helped her onto her side.
Her face was flushed and sweaty. Her eyes were bright and her breath was hot as I lay next to her on the bed. I reached out and slid my arm underneath her head and just lay next to her enjoying her warmth and the waves of pleasure that we had just experienced together. My little sister. This beautiful new mom to be. It was in that moment that I had a revelation. I was in love with her. I had always known that I loved her. We loved each other, but now I understood that this had turned into something more. It wasn't just about sex. That might have been the catalyst that brought these feelings to the surface, but there was sometime deeper at the core of this. I knew that this couldn't be a one-time experience to help her go into labor. I was sure that this was just the beginning of a long and passionate love affair. I knew that most people wouldn't approve because we were brother and sister, but I didn't care.
The only problem might be Karen. She would be gone for a few more days and that would give Lindsey and myself more time to enjoy each other, but she would be back. How exactly would things change. Would she understand? Would she freak out? Would she try to stop us? I realized then that I loved Karen just as much. And I had an overwhelming desire to be with her in the same way that I just got to experience Lindsey. I wanted to make love to my older sister just as much. I wanted to taste her and feel her. I wanted to be inside her and look into her eyes as we came to the heights of pleasure together. I wanted to make her happy. I couldn't lose either one of them. I made a decision right then that no matter what, I would figure out a way to keep the three of us together. We were a family. We had a baby coming.
I turned and looked into Lindsey's eyes. Her breathing had steadied and she looked back at me for a long moment and I could see the contentment in those eyes. Then she leaned over and kissed me. It was slow and soft. While our lips were pressed together I reached out and gently stroked the side of her face, brushing a loose strand of hair away and then slipping my hand behind her head I pulled her in tighter. Her lips parted slightly, inviting me in and my tongue slipped inside, tasting her delicious mouth. I explored her mouth now, slowly, savoring every sensation. The feeling of her tongue against mine, her perfect teeth, the roof of her mouth. I pulled away and took her bottom lip in my mouth, playfully biting and sucking on it. I don't know how long we laid there, naked, and content, slowly making out. Then we lay back and just stared into each other's eyes.
Eventually we made our way out of bed. She headed for the bathroom and after a few minutes I heard the shower running. I thought about joining her in the shower, but I honestly thought there probably wouldn't be enough room and I didn't want to make her uncomfortable. I walked out of her room and down the hall to the little half-bath and cleaned myself off as best I could. I washed my hands and face, then used a washcloth to clean of the film of dried cum that had harden on my now soft cock. Then I threw on a pair of boxers and a t-shirt and went to the kitchen to get a pot of coffee started.
As I leaned against the counter and watched the coffee begin to brew, I wondered if that sex would really be all it took to cause Lindsey to go into labor. I wondered is she was in the shower right now, cervix dilating and feeling the contractions. I was sure that I would know if things began to happen. I hoped it would take too much longer for her. I knew she was in a ton of discomfort, bordering on pain and more than anything else, she needed that baby to be born. At the same time, I caught myself hoping that things would still have a while. I liked having sex with my sister and hoped that we could enjoy it again.
I heard the shower shut off and gave her a few minutes to get out and dried off before checking on her. I fixed her a cup of strong coffee with cream and sugar and took it to her door. After knocking softy, I pushed the door open and saw her sitting in the side chair by her bed. She was wearing an oversized, fluffy bath robe and had her hair pulled up in a towel turban. After seeing her naked, the sight of her covered in fluffy pink fuzz nearly caused me to laugh, but I quickly recovered and handed her the coffee. She thanked me and took a long sip, savoring the hot, rich, creamy drink, then sat it on the side table.
"Any baby coming out yet?" I joked. She cocked her head to the side, scrunched up her nose, and gave me a sarcastic glare.