144. Jump in and double fuck Kouki.

Vanity/Lust Chapter 3: Methinks the lady doth protest too much.

I couldn't look away, just mesmerized by the sight of my beautiful and sexy sister acting like a total whore. As if reading my mind Shinji pulled back and directed Kouki, "Here, get on top," as he moved to lay down on his back. Even in the poor light, only the reflections of moonlight really, I watched with awe as she straddled his hips and with one hand grasped his long sticky cock, pointing it up as she guided it to her slick hole and let it pierce up into her as she sat down upon it. Then she started moving her hips, bouncing away as she fucked him, making her ass cheeks rippled with the repeated impact of her hips onto his.

It looked like so much fun I couldn't resist anymore. "Getting a little greedy aren’t you Shinji?" I laughed as I stood up away from Setsuko and strode in through the bedroom door.

"It’s all good. I’m still single until tomorrow," Shinji said like it was no big deal.

Kouki on the other hand squeaked with fear and might have jumped away had I not quickly moved in behind her to hold her down. She struggled to wiggle flee, but I pinning her onto her lover’s chest and speared onto her lover's cock. "Where you going, sis? Don’t you like fucking Shinji’s cock?" I teased then I grabbed her hips and bounced her ass hard onto his dick a few more times, forcing her to continue fucking him and causing her to uncontrollably moan. She stifled it out of fear and embarrassment, unsure what she should do now that I had discovered them. "Isn’t that what you like slut?"

"She fuckin' must! She’s getting super fuckin'tight!" Shinji cheered as he grabbed at her bare breast with a giant shit-eating grin on his face. Kouki refused to look at me, trying to silently hide behind only the curtain of hair covering her face since I wouldn’t let her get away.

That started to make me a little angry so Reached around and pinched her chin hard in one hand, twisting her head back and forcing her to look at me. "Answer me slut!" She finally looked me in the eye and I saw her lust hidden beneath tears, yet still didn’t answer me. I just couldn’t take her insolence anymore. If she was going to act like a dumb slut, then I was going to treat her like one. I spit angrily in her face and released her as I grabbed my own pants and yanked them down. "I think you do like it. You are a just slut just like every other cunt. And I should have done this a long time ago."

I don’t know what she thought I was going to do, but punching my cock right up her dry asshole must have been pretty low on that list by the way she screamed. Somehow that made me just enjoy it all the more. I’d often fantasized about fucking Kouki, but really never like this. As I started pounding my cock up her butt I was sure I could feel Shinji’s dick pushing back up at me through the thin wall of flesh that separated her sphincter from her vagina. I’d forgotten all about Setsuko behind me until she finally found her voice getting over the shock that this whole affair had caused, keeping her silent until now.

"You fucking animals!" she screeched. I looked over at her as she looked ready to kill, but then just turned and stormed off. growling, "And to think, I almost...Arg!" Well, fuck her. She was just another stuck up dumb cunt and would get hers soon enough.

"Awww... Fuck! I’m cuming!" Shinji grunted out as he grabbed her hips and tried to pound up into Kouki’s pussy. Then I noticed that she must have passed out as she had stopped crying as we brutally sandwiched her between us. Then I felt the other man's cock twitching against mine inside her and that put me over the edge as well. I groaned with ecstasy and shot my own load up into her bowels and it was like no orgasm I’d ever had before. It saw soul-rending; like a piece of me was being cut off inside of her, or she was sucking out a piece of me. That’s the only way I could possibly describe the agonizing pain that ripped through me as I peaked in my pleasure.

When it was over I collapsed as well, utterly exhausted. All I could feel was a numbness like my cock had been ripped open and I was dying inside Kouki. All my strength and endurance were sapped by whatever had happened. From our panting pile of flesh, Kouki stirred first and easily rolled me over and off of her as I slumped down next to Shinji. By then I should have known something was wrong, but my mind just wasn't registering anything right. For some reason, the goofy look on Shinji’s face was comically frozen. I tried to speak, to ask him what was so funny, but nothing came out. My throat was parched dry and I couldn't summon the breath to form words.

Then Kouki straightened up and tossed back her suddenly vivid mane of purple hair. It looked amazing, kind of like Chizu’s, but then I could see it wasn’t her hair that was purple, but some kind of aura that surrounded her whole body, making her glow slightly. I figured I was just seeing things with the exertion and fuzzy-headedness that goes along with an orgasm, but then she looked at me and her glowing purple eyes were like twin infernos of magical fire.

<I should thank you for how good you’ve been to me Kenji,> she said with an unnatural echo in her voice, and suddenly I knew what had happened. That was the same voice that had been haunting my dreams since yesterday. There really was something that had been inside me and somehow raping Kouki’s ass had pushed it out of me and into her. Then I saw her hands were plunged elbow-deep into Shinji’s chest. Blood and viscera oozed out around her pale arms and ass she pulled them free out with them came all his gore and blood coating her entire arms dark red.

Terror gripped me, holding me paralyzed even though I knew I had to run, but that it was already too late. Still, I stubbornly tried to move my body, but like lightning, she pounced upon me and grabbed my limp dick and in her tight bloody hands. <You’re right brother dear. I am just a cock hungry slut.> she teased and then brought her mouth down to my groin to tickle my sensitive flesh with her tongue. For the next minute or so she just drove me insane as she slowly and gently caressed my manhood unwillingly back to a proper erection until she sank her teeth into me. Even then the mind-numbing pain had its own kind of ecstasy.

I started cuming again, spurting whatever I had left down her throat before she literally tore my flesh apart in her vicious maw. My sperm and blood just gushed out of my mauled crotch and in horror were forced to watch as she actually ate my cock bite by gruesome bite, and still, I was frozen from being able to act. Then I realized it was because I was dying myself. At some point, her fingers had dug into my sides and her hands were worming around inside of me, rending and tearing my numb flesh as she devoured me, piece by bloody piece.

When I was empty and on the verge of death she brought her blood-splattered face up to mine and forced a kiss on me. Unable to move or resist due to the lethargy as I bleed out, my last memory is everything fading to black as my sister sweetly said, <Goodnight and thank you brother dear.>