Kouki is sneaking into her brother's room while he slept...

I looked both ways, but I didn’t expect to see anyone as I slipped inside Kenji’s bedroom. He had spent a good long day plowing the fields and deserved his afternoon nap, but I just couldn’t help myself. This was really the only time where I could get him to myself for quite a while now, so I wasn’t even the least bit guilty about stealing some time alone with him.

He was snoring softly already and twisted up in a funny position on the bed as he always did, and that cute trait always made me giggle, but I kept it very quiet. I approached the large bed and gently lifted the covers on one side and stealthily slid under them. The rich feel of satin and silk even more excited, even though this was my bed as well, just I was getting overexcited already thinking of what I was about to do. I’d dreamed so many times of making Kenji my lover, but it took being possessed by a malevolent spirit to spur me to fulfill that dream. And after that, there was no excuse for anything being off-limits anymore.

My head found his naked chest under the sheets first since his arm on this side up by his head, and while I could still smell the sweat of a hard day’s work toiling under the sun on him, he’d washed and scrubbed all the dirt and the worst of his stink away. Part of me almost regretted that as I kind of liked him dirty and sweaty. It gave the truth to the fact that I wanted to get dirty with him, that he was using and despoiling me as we made love. I never really told him that, but getting all messed up with his filth really got me wet.

Gently I hovered over his nipple and kissed it. Even as a guy his pimply skin started to stiffen slightly at my ministrations as I swirled my tongue around it. This wasn’t enough to wake him, but I couldn’t risk waiting anymore. My plan was for him to awaken, find me doing sexy things to him, and then take me hard with his unleashed desire. All the while I would still claim I was just playing and beg him to go slow as he ravaged me. But it would clearly take more to let that beast loose, so I pushed down his strong smooth belly, tickling it ever so gently with my tongue as I left a wet trail behind it.

He was only semi-hard at best which was disappointing. Somehow he always had a hard-on in the evening when our sexy time normally began, and plenty of other times, but even with my teasing it had barely responded yet. ‘Well, he won’t be able to resist this!' I thought as I twisted my head down into his crotch. My chin pressed through his rough pubes as I used one hand to point his penis up and wrapped my lips around it.

For a moment I just stopped there, thinking I heard something. I thought he’d woken up, but then I heard muffled through the sheets his light snort and wheeze. He just had a start when I took him in my mouth. I caressed his love tool softly with my tongue and hoped his dream would be as good as the reality I was giving him and wondered if he could actually cum in his sleep. It took only a few moments for his manhood to swell so large I couldn’t fit more than half of it in my mouth anymore and I started slurping happily away at his cock like one of my own hands found the button of my clit and started circling it as I got off as well.

Kenji still slept, but had started moaning, clearly enjoying the blow job, but then to my shock, someone else snapped off the covers off of me and shouted, "Kouki!"

"Wha!" Kenji jerked up in bed, accidentally pushing me over and off of his swollen groin as he awoke with a start. "What’s going on?"

"Your sister is getting fresh without me!" Setsuko scolded me. "And trying to do it behind my back!" Kenji just then seemed to realize that his cock was not only pointing up, but that it was quite wet from my saliva.

"You know we had an arrangement..." he began, but I glared at him to shut him up. I had to say something before I looked like the bad guy.

"Our arrangement?" I growled. "Only to play around with Setsuko's permission, but then never have you for real?"

"What do you mean?" he asked confused. "You and I have…" He couldn’t bring himself to say it. All these months a year after we first had sex and he still couldn’t bring himself to state the truth.

"Yes, we have sex," I conceded, but continued. "But you never cum inside me. You didn’t a problem doing that with Setsuko!" I pointed at the woman who was now officially his wife, now very heavy with child. She was supposed to be in town having an examination with Yuki who was going to be her midwife and that’s why I thought this would be a perfect time. In a few weeks, Kenji would have a child and I’d never get any time alone with him.

"What? That’s not true," Kenji said, but then amazingly Setsuko came to my defense.

"You know, I think she’s right," my sister-in-law stated contemplatively. "You’ve cum on her face and tits, even in her ass a few times, but whenever you get close with her you always pull out." Kenji was speechless, and I wasn’t sure it was not out of having this truth exposed.

"Don’t be silly. I’m sure I must have…" he began, but his wife cut him off.

"Are you worried about **** kids with her?" she asked him and then I realized she was right. That was it, I could see it play across his face from the moment she said that. The reason I’d been denied the same joy of making a new life Setsuko was ripe with wasn’t because he didn’t love me as much as her, but because he loved me too much and didn’t want to inflict any baby that was less than perfect.

"We are only half-siblings," I stressed again to him as if he didn’t know that and proceeded to reason with him how silly his fears were. "Sure I’ve heard the stories about those nobles that interbred for hundreds of years and come out like monsters, but we’ve fought a real monster and it’s not like our parents were related."

"Yeah, I guess…" Kenji grumbled begrudgingly.

"No ‘I guess.' She’s right, and you’ve broken our promise to be treated equally," Setsuko sassed him, hands on her hips with all her venom directed at him now instead of me for violating our threesome only agreement that we’d made after we awoke from the oni orgy we had. While they got married a month later when Setsuko realized she was pregnant, even on their wedding night I was a full participant in their bed and treated just as much the newlywed bride as Setsuko. Since then I’d really come to treat her as if she was my true sister that neither of us ever had and I realized she wasn’t as much a spoiled brat as I once thought, but more the intelligent woman who just knew how to use her beauty to get what she wanted.

"You both are clearly ready to go," Setsuko said opening up her extra-large kimono to expose her rotund belly blemished only with the dark seam that now split down her middle from the **** growth of their child practically ready to burst free. She eased it off her shoulders, leaving her naked with her fat slightly lactating tits riding on her stomach now as she eased herself down nearby on the palatially large bed. "So Kouki, get down here lick me off as Kenji finally gives you what you deserve." She gently rolled onto her back and spread open her legs in front of me displaying her fuzzy twat that was darker than the hair on her head, but still blonde.

With eagerness, I crawled in between her milky thighs and nuzzled right into her musky crotch, and lapped away at her sensitive bits. This wasn’t something new as we had both found that having sex with each other was sometimes even more fun than with Kenji, but neither of us would give up on the wonderful feeling of sex with him, nor our love for him. We more had a respect for each other, and really liked the way it inspired my brother to get really lusty with us when we did it. I supposed that’s one thing to thank the oni for, even while it had possessed us with plans to destroy the world, I don’t think I’d ever had truly revealed my love for Kenji without it.

With my ass up in the air behind me, I felt Kenji move up behind me and the prodding of his lovely hard tool as he positioned it at the entrance to my wet womanhood. Now with practiced ease, he slid up inside me, filling up my emptiness and I groaned with pleasure into Setsuko’s muff, stopping my licking only briefly before I went back to working on her. I was so wet I could barely feel him moving as he started off slow so I pushed back with my hips trying to get him even deeper inside of me. With his hands on my hips, he got the clue and grabbed me harder as he started slapping my ass with his hips. After that, it got harder for me to keep my head in place as my brother’s thrusting got more intense, so I placed two fingers where I’d been licking on Setsuko’s button and began frisking her quickly.

"It’s coming," she groaned as I felt her pussy gush under my fingers, but I was getting close as well, so closed my eyes and gritted my teeth, squeezing down hard on Kenji’s rod as it wonderfully rammed me so hard and deep.

"I’m cuming too!" Kenji gasped as his thrusting abruptly stopped and I finally felt his cock swell up and burst forth its salty baby making juices into my womb for the first time. My body quaked and convulsed as well with my own orgasm being triggered by being touched inside impossibly deep and I almost drew blood as I bit my lip to keep from screaming. I’d felt his sperm on my skin and tasted it on my tongue what seemed like hundred times before, but nothing compared to the warm fullness in my belly where it truly belonged. I felt his dick jerk over and over as it pumped what felt like a gallon inside me as I just held still, absorbing every amazing sensation.

"No, the baby!" Setsuko groaned, clearly in pain and gasping for breath. "It’s coming!" With that, I opened my eyes, and right in front of my face, I saw the once thin creased folds of her pussy now stretched tight as a flat rounded head of Kenji’s child was already emerging out of her.

"What!?!" I said, eyes wide with shock, and jumped back to give her some room. Kenji reacted much the same way, only very sluggishly, making me physically push him out and away from me. "Quick! Get some water. I’ll get some towels," I yelled at him.

He staggered away and ran out of the room, still naked while I grabbed the linens while Setsuko screamed in labor pains. I only just slid the cloth in place in time when the tiny bloody head came free quickly followed by the rest of its little body, though it was still connected to Setsuko by a thin long purple umbilical cord. Kenji ran in moments later with a bucket of water as I examined the fragile life in my arms.

"It’s a boy," I said with a smile that stopped him cold. In a moment of stillness there I was standing up from between his wife’s legs, covered with his bloody child wrapped in just a sheet against my own naked small tits as he started to squall in his first breaths of air, and his now cold spooge dripping out of my gaping full twat running down my leg. He dropped the bucket and encircled me up in his arms and kissed me.

We’d had sex and made out before, but he’d never given me a kiss quite as powerful as that one. If it hadn’t been for his child between us I’m sure he would have crushed me to his chest with his fierce hug, and while it only lasted a moment I knew that moment was profound and life-changing for him. I knew it would be, for all of us, but even I knew it was more than that. I couldn’t help but feel his dick press into my stomach, already hard again, and knew something about this really had turned him on, and it made me hopeful that not only would he have a big family with his wife, but me as well.

I eased him back and said, glancing down to confirm with my eyes what my stomach had already felt and my insides quivered about getting him back inside me, but now was not the time. "Go get a sharp knife and a kettle of boiling water," I instructed as I went about the basics of preparing his baby for its proper life. I’d never delivered a baby before, but I’d been coached on what to do when in preparation. It was at least another few minutes before my sister-wife expelled the after-birth, but soon after the now clean and untethered child slept atop her warm breasts as she and Kenji snuggled up to her gently pet him with endless awe and wonder.

To give them some time alone I gathered up all the linens that had been soiled and bloodied by birth together and brought them to the washroom to soak them in soap before they stained. I hadn’t bothered getting dressed, for while it was early winter the roaring fire to heat the water made the room quite warm and made enough crackling noise that I was surprised when Kenji snuck up behind me as I bent over the washboard.

"Kenji?" I gasped, but it was clear he wasn’t here to speak as he **** his cock back inside me roughly. It was painful since I wasn’t wet now and in fact, his dried sperm acted like glue to keep my pussy closed up to keep his first load inside, but I didn’t complain and just let him have his way with me. This was exactly what I’d wanted a lifetime ago when the day was new, and my whole world had changed in just the last few hours. My body quickly gushed its lubricating juices to accommodate his manhood inside of me again and soon I was just hanging onto the washboard as he pounded my rear once more hard and fast.

I didn’t cum this time when he did, but I still felt wonderful wondering how I had any room left in me for his fresh load and imagined my own belly swelling full of his children as they burrowed into me to quicken into his next child. He held me like that, bent over for a long while, gasping as we both let him squeeze out every drop inside me. When he was finally sure every last bit was released as deep as possible his already shrunken penis left my warm embrace leaving me to feel cold and empty.

I grabbed a pair of just-washed panties and quickly put them on teasing, "I want to keep as much in me as possible this time."

He just smiled as he sat back in a chair saying, "Kouki I love you, and our baby will be beautiful."

I rubbed the front of my panties and while it was impossible to know for at least a few weeks I somehow knew our first child was already taking shape inside me. "They all will be," I sighed and he just laughed. "Now, I have work to do, and you better take care of Setsuko and your little boy or it’ll be no supper for you," I teased. He laughed harder and held up his palms in surrender as he retreated back to our bedroom.