To Love Your Brother

Rei sighed. Walking into the flat, she let the door slam slightly, making it very clear that she was home. She set her keys on the small table and greeted her brother, who helped her out of her clothes.
“Hello, Shinji. How have you been?”
“Hello, Rei. I’ve been a good boy…”
She frowned at that. She was still training him, but he had improved rather well after she’d broken him in. she decided to give him the benefit of the doubt.
“well, I’ve had a pretty hard day myself. Now you can help me relax, Shinji. You know what I like….”
Shinji, still not entirely accepting his fate with his whole heart, nodded and leaned in to give his sister a kiss.
And that was all Rei needed, really. Just a small intimate kiss, bearing warmth and contact to close the gaping hole in her soul. But somehow, it just got her even more stressed out.
Their kiss grew more passionate, and Shinji began to remove her clothes. Carefully, he removed her top, her shirt, her skirt and her bra. He then laid a hand on the enormous bulge in her panties. It grew even as he stroked it, nearly a foot long and as thick as his arm.
“Shinji…. “
Rei’s voice sounded winded, out of breath. Knowing what followed, he knelt in front of her and removed the last piece of clothing restricting the gigantean cock from freedom.
It bounced loosely as he pulled her panties down, hitting him on his head softly. Rei giggled as he maneuvered the pants from under her feet, his head still rubbing against her stiff cock.
“very good, Shinji. Now…”
He didn’t need to her the request anymore. He knew that if he didn't to as expected, he’d be punished. So, kissing his way upwards, he let his mouth trace the shaft to its tip and bean to engulf her tip, slowly running his tongue around it as he prepared to suck her off. Then, bracing himself and taking a huge gulp of air, he pushed his mouth further along the shaft until it hit the back of his throat.
He almost gagged, but experience told him to suppress it. So after a few seconds, he forced the cockmeat down his throat. Down, down it went. The warmth of it seeping through his throat as he braced himself against he floor.
Looking up, he saw Rei arching her back in ecstasy, uttering a low moan as she held one breast and fondled herself.
“Oh… Shinji! So good! Deeper… deeper!”
He forced the last five inches down, and pressed his face against her belly while stuffing two fingers up her honeypot.
“Ah! Gha! Shin-Shinji!”
He then began to pull off, sliding the cock back out about six inches, then pushed it back in. Rei was leaning heavily against the wall, her breath too ragged to express herself.
He felt the need to breath, but knew that Rei was already well on the way. It would only take another thirty seconds or so.
Speeding up, he rocked his throat over her penis, pumping his fingers into her at the same rhythm he sucked with. Until…
“Oh! Ah…AH! SHI-SHINJI!!! I’m going to cum! Nyah-ha…ghe-“
He felt the tip in himself flare, growing thicker. He pushed forwards with all his might and his fingers deep into her pussy, maximizing the effect on her. Shutting his eyes, he felt the penis twitch, then again, more forcefully. Rei seemed to lose all control over herself, and fell over him, draping her body over his back and began humping him forcefully. Once, twice…
He felt it pump the thick sperm through the shaft, the cock growing slightly harder and thicker each time it spasmed, and when it finally spewed out inside him, he felt the heat sear his stomach as it traveled down his tube. Rei pushed it as far as possible down his throat and screamed as the last spurt coated his insides again. Her panting and sweating form then fell inert as the exhaustion took over, her body growing limp and falling over Shinji’s breathless form.
Shinji caught her, and rolled off to the side. By now, he was desperate to breath, and as he gently rolled her onto the carpet, he pulled his head back, feeling the huge penis inside him slip out, out, out until with a squelch, it came free, trailing some strands of sperm along with it’s slowly softening form.
Shinji fell back then, falling to his knees once more and both resisting the urge to throw up as well as trying to breathe in as much needed air as possible.
For a while, both of them were panting, sweating on the floor.
After a few minutes, Rei caressed her softening cock.
"You've learned well, brother… that was very good. I hope it was just as good for you as for me…"
Shinji could only lay there, facing away from his sister. For how long had he been subject to her whims? No longer that three months, perhaps. She worked, came home, and trained him for all that time, while her practiced at home and kept the house clean and ready for her. Not long ago, they had defeated Seele, driven with the revenge at Asuka, at mother, at his friends…
And Rei…
Rei was all that remained to link him to his past. And a terrible past it was. He knew deep down that what was happening to him was punishment for all the things he'd done. All the people that had died in his carless battles against the angels, against his father, against Seele, Keel…
He watched his comrade die, the white monsters ripping into Asuka's Eva, her screams of pain and suffering still ringing in his ears. And he had torn into them as well. Worse, even more bloody, filled with hate and revenge and the need to destroy….
Soon, there had been no Evas left to slaughter, and he turned against his father's organization….
"Shinji…"
He felt a hand pressing against his shoulder blades, a thumb circling his spine.
"Yes, Rei"
"I need to pee… help me"
He turned to her, and got up. Picking her up, he carried her naked form to the bathroom. The soft tube in her lap bounced off his shirt, leaving a small trail of sperm clinging onto his clothes. Blushing slightly, he carried her in, opening the door with an elbow.
Rei held on to his neck, her arms pushing her breasts together. She smiled. Her Shinji would look to every need she had, and do whatever she said. And she felt a twinge of shame as she thought of what she was going to do later. But he had wanted it, after all, so she conceded in acting out his deepest wish.
Shinji let her legs down gently in front of the toilet, holding her torso up around her belly and steadying her body against himself. Rei was still hanging on to his neck, and as he lowered himself she wrapped an elbow around it. Shinji's soft hands gently aimed the penis, pulling the foreskin back slightly.
Rei gasped at that, and her cock almost began to stiffen a bit. Then she relaxed, and let her bladder upend all she had.
Shinji corrected he aim a bit, and tried to adjust for the varying stream she let go. He could feel it stiffening, which might be the cause for the irregular stream. She finished, and he gently milked the shaft twice, shaking the last drops out, and watched as it began to grow seriously hard once more.
He looked at her ace and knew the next thing would be a shower. He hoped he'd meet her expectations this time, and if not, at least she'd be satisfied one way.
"Shinji, that was very good! No less than was to be expected, and you even corrected. Now, undress, and let's shower. I hope you prepared?"
He let her go, and she leaned on the washbasin slightly. He nodded, flushing the toilet and letting the seat down. Breathing in deeply, he began to remove his clothes. As he pulled off his shirt, he saw Rei bite her lip, and he felt a slight rush of personal pride wash over him. The battles against the angels, Evas and finally real live people over a stretch of almost six years had granted him a variety of scars and muscles as well. Now 20, he was quite an attractive man.
Rei's hands traveled down her stomach, and rested on her cock, already fully erect and bobbing with her heartbeat. He took off his trouser, pants and socks until he was standing naked in front of her, staring down at his feet. Suddenly a cock bounced into his field of vision, and he looked up to gaze into Rei's mesmerizingly beautiful red eyes.
"Shinji-"
"Please, Rei… don't…"
She looked like she was about to continue, but his eyes told her not to. And that was the way it went. She seemed in control, but in reality, he was the one that forced himself. She loved him, and that was a fact, and she would do anything, absolutely everything, to please him.
Even if it meant abusing him.
She grabbed his head and pulled him into a lustful, desperately needy kiss, and pressed her entire front against his, her cock pressing against his belly.
"…now.. let's shower…. Shinji…"
She kissed him again, and let one hand fall down his hips, then dig into his ass. Relived that he had lubed this time, she let him go, and followed him into the shower. He turned it on, gauged the temperature and turned the heat up just slightly higher. She clasped a hand around her tip, stroking slowly, readying herself for the session's main attraction.
"It's ready, Rei…"
She stepped inside, and felt the heat run down her body, arousing her even more. Pressing herself up against him again, she rubbed herself against him, sharing what little affection she could with him.
"Shinji… lean forward…"
He was shivering slightly, still not happy with his fate. Nodding slightly, he braced his legs against the floor, his arms resting against the shower wall, the hot water running down his back as he held his ass out for her.
Rei was amazed at the play of muscles the simple movements provided, and her cock literally ached for his ass. Moaning in anticipation, she moved closer, positioning herself at his back entrance.
Shinji whimpered softly, but held his body rigid, trying to relax his anal muscles a far as possible.
Rei took a firm grasp of his hips, and pressed the tip against his asshole. Pushing gently, she eased the tip in halfway. The grunt coming from Shinji didn't sound too painful, so she assumed he had prepared properly. She then laid her other hand on his hips, and repositioned her legs to steady herself. Then, with one strong push, she forced the foot long cock up jis lubed ass, making him grunt in pain.
"Ah…Ohgod… yes.. so tight.."
She stayed still, enjoying the peaceful warmth clasping ever so tightly over her penis. It almost made her fall over, but she remained standing.
"Rei…ah.."
He felt every inch of her dig in, spreading him open and igniting a dull sense of pain all the way up his colon. It was so huge! So long.. so.. hot…
"Ah.. Shinji.. you're the best…"
Rei then pulled out, about half way, then rammed herself back inside.
"Oh yes! So fucking tight!"
She pulled again, this time further, almost up to the head, and forced it in again quickly.
Shinji felt it pierce him again and again, slipping in and out of his ass, spreading the lube all the way up his insides. The pain was bearable, almost fading, and his cock was already warming up as she sped up, establishing a nice, rhythmic beat to her pumping.
She was heating up inside, her breasts bouncing slightly as her hips met his own loudly, the hot water running down her back egging her on to speed up, fuck him harder
She pulled out until it was almost entirely out, and leaned down to give the cock an angle to his ass, then pushed upwards. Shinji felt it scrape against the back of his colon, and he felt some pain return.
She pushed herself upwards, gaining height, and pulled the tip out against the front of his colon, making him grunt in pain.
She repeated the motion, faster, and then leaned sideways, first left, then right, then left again. His grunts turned into painful moans, mixed with pleasure. His cock was rock solid, the head fully blown up as she fucked his brains out.
Every now and then, Rei pushed hard, burying herself as deep as possible inside him, her hips pressed hard against his butt, his head against the wall. His breath was forced, shallow, and hers became more and more so as well, pulling out again, it popped out wetly and she felt the water wash over her exited tip. Moaning in disappointment, she pumped against his naked butt twice, but finally managed to pull back again and grasp her shaft shakily. In her near orgasmic state, she missed three times, each time either sliding it along his back or against his belly. Frustrated, she took the inflamed tip and pressed it into him, and with a laugh of victory, buried it inside him again, moaning in ecstasy. Leaning over his back, she grasped his torso, and speeded up again, her face pressed against his shoulder blades.
Shinji was still grunting, feeling the shaft penetrate him again, the pain returning slightly. But overall, he knew he deserved it, and let his defenses recede, to leave him exposed to the onslaught of experiences the act caused within him. And in some way, he was almost, but not entirely, happy with this arrangement. As he felt her lean forwards onto his back, he couldn't help but force his grimace into a smile for a second.
At least she was happy.
She moaned, and pumped even faster, her hands clamping down on his shoulders, signaling her onrush of joyful torture. She moaned louder, and pumped heavily into him, until her moan turned into a scream, and she pressed into him as hard as possible, spraying her semen into his intestine, again and again..
"Shinji! Oh god I'm cumming, Shinji! Ahh! Ahh!"
His cheek pressed against the tiled shower wall, and his breath coming short, he could do nothing but listen to her screams and feel his insides being flooded with sperm. He felt Rei collapse on him, and almost slide off sideways. Catching her just quick enough, he felt the penis slide out of his butt, and she hung off his arm as he tried to stay on his feet. Unfortunately, he slipped on a tile and fell, but managed to land facing upwards, and Rei's unconscious form landed on his chest, unhurt.
Wincing in pain coming from his ass and his back, he held her close, an arm around her back and another on the back of her head. Pressing his face against her shoulders, he wept softly. In joy as well as in sadness. For all her fortune and misfortune. For all his pain and all his happiness. For him, and the world.

A/N: Now first, I'd like to point out that this story was inspired by a very good Futa artist, who goes by the name of Nobody In Particular. I have his permission to use an idea he drew for this story, and his blessing to post this here. So special thanks to him!
Well, I hope you liked it. The ending's weird, I'll grant you that…. I may edit it later.
Yours sincerely,
Henryjamesthefifth