Disclaimer: I do not own Owari no Seraph (Seraph of the End). I write this for your enjoyment only.

Sinful Love

"Anytime you're ready, Mika…"

Mikaela Hyakuya was snapped out of his brief trance when he heard Yuichiro's voice calling to him from a few yards away. The two orphanage brothers were standing across from each other on the beach not far from the village where they were staying. It was late night and the villagers as well as the rest of Shinoa's Squad had already retired to their homes for the evening, but Yuu and Mika were not yet ready for sleep; they told their friends that they would stay up awhile longer to spar on the beach to sharpen their sword-fighting skills so that they would be ready when their enemies finally came for them. Which could be any day now.

The moon was full tonight and shone brilliantly on the horizon with the countless stars twinkling in the sky, providing enough light for the brothers' sparring match. The sound of waves crashing on the shore also set the mood and Mika grinned as he charged forward, his blade meeting Yuu's with enough force to knock over an ordinary man. But the ravan-haired boy, with his enhanced demonic strength, held his ground as he returned his vampire brother's smirk before sending a blow of his own, his green eyes full of fire.

So it was as Shinoa said and Mika suspected: Yuichiro was indeed an excellent swordsman. Even the vampires he had fought with in the past as well as Guren's own squad mates admitted as such. And as much as Mika despised his brother's ex-guardian, he too, had to admit that Guren had taught Yuu well in swordsmanship, so much that Mika could fight him without holding back.

Even with his vampiric strength, the blond vampire found himself staggering under the amount of sheer, raw power behind Yuu's attacks, something that would have been impossible for an ordinary human. But he knew his brother was anything but: the demon and seraph within his body gave Yuu a strength that could potentially rival even the most powerful vampire progenitors at the rate they were progressing.

Mika knew this was a double-edged sword. If Yuu became stronger, his power could end the human-vampire war for good. Or it could destroy the world depending on whether or not he could win control of his mind and body from the monster inside him. The future was still uncertain, but Mikaela refused to give up hope, and he was determined to do anything and everything he could to help his brother.

And although Yuu had raw power, his greatest weakness was letting his emotions control his attacks instead of careful strategic thinking. All Mika had to do was stay on the defensive and wait for an opening to present itself as his brother went all out, relentless in his attacks, striking over and over again non-stop. He knew Yuu wouldn't be able to keep this up forever and found his chance when his brother brought his blade in a wide arc as he grew frustrated with being unable to break through Mika's defenses. Yuu's overpowered strike left him wide open enough for Mika to finally make his move and counter with a strike of his own, his blade aimed at the base of his brother's sword and the next thing they knew, Asuramaru goes flying from Yuu's hand as he falls flat on his back and buries itself half-way to the hilt in the sand several yards away. Now that Yuu was finally unarmed, Mika took a quick breath as he brought the tip of his blade to rest at the base of the other boy's chin.

"You did well, Yuu-chan; but you still have a way to go." He said triumphantly but not without a good-natured smile.

Now it was Yuu's turn to grin. "Well, thanks a lot but in case you haven't noticed, I'm not a child anymore so you can drop the 'chan'. It's just Yuu now."

Mika smiled but said nothing as he offered his hand to help his brother up. Yuu took it without hesitation as he allowed Mika to help him stand. As soon as the younger boy was back on his feet, he noticed Mika stagger for a brief moment before quickly regaining his footing.

"Hey, Mika, are you all right?" Yuu asked, his brow furrowing in concern.

The blond placed a hand on his chest and took a breath before answering.

"Yes, Yuu-chan, I'm fine. It's nothing." Although Mika tried to sound confident, his brother wasn't so easily fooled.

"Please don't lie to me, Mika, you're hungry, aren't you? Come on, let's get inside and have you fed. We need to do it while the others are still asleep."

Mika wanted to argue but he knew Yuu was right. His brother could be just as stubborn as himself when concerned with the well-being of those he cared about. After watching Yuu pick up Asuramaru and slide it back inside its sheath, the pair made their way back to the house.

Knowing the others were most likely asleep, Yuu and Mika made sure to open the front door and enter the house as quietly as they could, removing their shoes at the front to prevent loud footsteps that might awaken their friends. This time, Mika insisted on using Yuu's room instead of his own to save him the trouble of having to carry the other boy to his room in case he was too drained and tired to get there himself after he finished feeding Mika. The last thing they needed was for Yuu to stumble, fall, or pass out in the middle of the hallway which would wake the others for sure.

As soon as they were inside, Yuichiro closed and locked the door behind them before setting down his sheathed sword on the dresser with Mikaela following suit. After that, Yuu removed his shirt as usual. Though he had managed to avoid getting bloodstains on his shirts that would give away the fact that he was donating more blood to his vampire brother than Shinoa would have liked, Yuu wasn't sure how much longer he could hide it because the others had noticed him stumbling and losing his footing every now and then because of anemia. Even though he insisted that they were the result of his clumsiness.

Mika himself disliked the fact that they had to lie to their other friends whenever they were questioned, but Yuu assured him that it was all right as long as no harm was done; he believed that everyone was entitled to their secrets, after all.

"Would you like me to lay down or sit up tonight, Mika?" the raven-haired boy asked.

Mika thought about it for a moment before answering, "Lay down. But let me hold you up this time."

"I don't understand."

Knowing that it would be easier for him to demonstrate rather than explain, Mika took Yuu's hand and led him to the bed. Sitting down, the blond vampire made a beckoning gesture.

"Here, sit on my lap" he instructed.

Curious but not wanting to argue, Yuu obeyed and turned his body so that he could sit on Mika's lap like a child. He felt silly doing so, but knew his brother would never ask him to do anything unless he had a good reason.

"Just relax, I've got you" Mika said gently as he put one arm around Yuu's shoulders and the other on the small of his back to support him.

It wasn't long before Yuu caught onto Mika's plan and tilted his head back without hesitation, baring his throat and giving Mika full access to it, something that no sane human would do for a vampire they didn't trust. So far, Mika had fed only from the sides of Yuu's neck and wrists. But this is the first time the blond vampire suggested biting him in the base of his throat. Yuu was curious as to why, but decided not to question Mika and simply indulge his brother for tonight as proof of his absolute trust in him. And to be honest, he did enjoy having Mika hold him like this, especially since it was just the two of them in the room.

Closing his eyes, Yuichiro relaxed and breathed softly as Mikaela opened his mouth, bared his fangs, and bit into his throat, eliciting a gasp from the raven-haired boy, who was unable to suppress the moans from escaping his lips this time due to the sheer amount of pleasure running through his body as Mika fed. It felt even more pleasurable than having Mika feed from his wrist or neck and before he knew it, Yuu found himself wrapping an arm around Mika's waist while the other slid up his back to clutch at the vampire's blond hair tightly, entwining his fingers in the silky golden strands.

If he could, Mika would have smiled wickedly knowing that Yuu was enjoying this just as much as he was. Krul had once told him that the blood of awakened seraphs, especially ones who were still virgins, was the most delicious a vampire could ever taste, and she did not lie. Knowing this, Mika had no doubt there wasn't a vampire on earth who wouldn't want a taste of Yuichiro's blood but he would never let any of them have it, for Yuu's blood was his and his alone to enjoy.

After he had his fill, Mikaela withdrew his fangs from his brother's throat and took a moment to look at the expression on his face; Yuichiro looked almost disappointed, like he felt it had ended too soon, but knew it had to since he would have fainted if Mika had fed any longer. He no longer had to give his brother the usual signal of tapping him on the shoulder, for Mika had fed from him often enough to know when he must stop.

Looking up, Yuu saw the blond's beautiful eyes swimming in desire and found himself undeniably aroused at the sight of his own blood dripping down Mika's mouth and chin. Most people would think him crazy for feeling this way but he couldn't help it; it wasn't just because Yuu found voluntary blood donating pleasurable, it was also because of who he was allowing to feed off of him as well. Both Yuichiro and Mikaela had known from a young age that they were bi-sexual, but hid it to avoid attracting ridicule and scorn.

In addition to their feelings for each other, they also had a mutual crush on their orphanage sister, Akane, as well. And while Yuichiro loved both Shinoa and Mitsuba, he couldn't deny that he was attracted to Mikaela just as much and knew his adopted brother felt the same.

"How do you like it, Yuu-chan? Does it feel nice?" Mika teased as he slowly licked the blood from his lips in front of the other boy before licking the puncture wounds on his throat as well, knowing it would excite him even more.

Yuichiro blushed, too embarrassed to answer but they both knew he loved it. Instead, the raven-haired boy tried changing the subject as he reached up and gently touched Mikaela's face, just like he did the first time his brother fed from him in Nagoya.

"Mika… why do you hide your real eyes? Do you hate them that much?" he asked curiously.

The blond frowned slightly. He knew Yuichiro was talking about the blue contacts he now wore to mask his new ruby-red eyes. Just because Mikaela was a complete vampire now didn't mean he wanted to see anything that reminded him of it, and Yuu wasn't the only one who noticed that Mika went out of his way to find contacts as close to his original eye color as he could while constantly cutting and filing his vampire talons to make them resemble human fingernails.

"I… I don't hate them… I just want you to see me the way you always have before. I don't want you to think any differently of me just because I'm a complete vampire now…"

Yuu smiled as he gently brushed Mika's lips with this thumb.

"Mika, I will never see you any differently; if you want to wear contacts because it makes you feel better, I understand, but know that your eyes will always be beautiful to me no matter what their color, ok?"

It was now Mika's turn to smile as he leaned forward slightly and whispered into his Yuu's ear:

"You know how I feel about you, right?"

"How we both feel… yes…"

That was about as much consent as Mika needed before he pressed his lips to Yuu's, savoring the sweet moment before adding a bit more pressure and sliding his tongue inside to sweep the hot caravan of the other boy's mouth. Yuu gasped at the sudden intrusion but soon relaxed and gave himself up to Mika's care, opening his mouth and allowing the blond more access.

Despite being a soldier who had seen and survived countless horrors on the battlefield, Yuichiro was still purely innocent when it came to matters of sensuality. And truth be told, Mikaela wouldn't have it any other way. Innocent Yuu may be, but he still knew that this wasn't the way brothers were supposed to kiss. For what Mika gave him was not a cutesie peck-on-the-cheek type kiss, but a full on, passionate lovers' kiss.

Still, he couldn't bring himself to care as Mika deepened the kiss and sucked on his bottom lip. Yuu couldn't resist the moan that erupted from his mouth. His eyes fell shut again and his breathing increased, the continuous sliding of their tongues filling him with pleasure. Yuu allowed himself to be pushed back until Mika was draped all over him, hands on either side of his head as he became more ardent and rough with his kisses. They both knew what they were doing was taboo and forbidden. Some may even call it incestuous even though Yuu and Mika were not related by blood; they simply called themselves brothers because they grew up in the same orphanage.

Yuichiro knew he should be ashamed to have such sinful feelings and desires for his best friend and adopted brother even though he felt no guilt for them. Neither did Mikaela. And why should they? Nothing done out of love could be wrong. Right?

Without thinking, Yuu found his hands wandering under Mika's shirt, his fingers brushing the toned muscles of the blonde's abdomen and chest, making him groan with pleasure. He was tempted to take it further before Mika finally stopped him by closing a hand around his wrists.

"Mika? What's wrong?" he asked.

"Yuu-chan, I think we should stop for now."

"But why?"

"Because if we keep going, I don't think I'll be able to hold back. I don't want to end up hurting you…"

"Is that truly the only reason?"

Mika hesitated to answer. It was no secret that love between a human and a vampire was a forbidden thing, but it wasn't like Mika could go back to the vampires anyway now that he had betrayed them for Yuu and would not hesitate to do so again. But that was not the only reason. It was because love was not something he was used to experiencing since he had been turned.

In the four years he and Yuu had spent apart, Mika had only the company of other vampires and the only one who had ever shown him any real kindness or genuinely cared for his well-being was, ironically, Krul Tepes herself, his vampire mother. She may have changed him against his will but Mika still had to admit that she had done him a favor as well because if he had died by Ferid's hands that fateful day, he would never have been able to reunite with Yuu.

As for Ferid, Mika supposed that in his own twisted way, his ex- benefactor did love him as well since Ferid had tolerated Mika's rudeness and constant threats to kill him despite knowing that he was stronger and could easily overpower him.

Even so, having Krul (and Ferid's) favor did not make his life in Sanguinem any easier. For the other vampires, especially Lacus and René, hated Mika with bitter jealousy. They would always call him the 'Queen's pet' or at best, her adopted son. But they would never honor Mikaela by calling him 'Prince'.

Still the blond didn't care; the only thing that mattered to him was finding and protecting his dear friend. And even though he loved Yuichiro with all his heart, he was so insecure that he didn't dare to think that he object of his desire would actually love him back; Mikaela felt that his love was sinful and impure, not fitting for the innocent boy in his arms.

"Yuu-chan, I…"

"What are you truly afraid of? I love you, Mika, no matter what you've become."

There, he said it. Now that the truth was out in the open, Mikaela Hyakuya could not deny it any longer. When Mika didn't answer right away, Yuu looked at him curiously and maybe a bit sadly too.

"Could it be that you really don't want me?"

The blond shook his head fiercely. "No! I do, Yuu-chan but… I'm afraid… I want things to be like this always, but it will be impossible because I know that you and the others will eventually grow up and leave me behind."

Upon hearing this, Yuichiro's eyebrows rose as if in understanding.

"Mika… I really believe the way to turn you back exists somewhere and I did promise I would help you find it, did I?"

"I know…and I believe it too! But how long will it take us to find it? What if we can't? I can't bear to see you die of old age while I'm stuck like this forever! I don't want to be left alone again; you're all that I have to live for now!"

With the vampire's confession came tears as he struggled to keep his voice down.

Yuu's mouth opened before it snapped shut. He inhaled sharply through his nose and held his breath.

"Mika, I...-"

Yuichiro hadn't realized Mikaela's feelings for him ran that deeply. So this was what the vampire was truly afraid of. After taking a moment to think it over, Yuu gently cupped both sides of his love's face, gently brushing away the vampire's tears with his thumb.

"Mika… I had no idea you felt this way about me. I… I understand. I've been trying not to think about it but you made me realize that we can't avoid this issue forever. And you're right; we have no idea how long it could take to find a cure for you so there is only one other option…

"And that is?" Mika had a feeling he already knew the answer, but wanted to hear it from Yuu's own mouth.

Pulling Mika down to kiss him again, Yuu whispered, "Mika… I feel the same way… so I want you to share your eternity… with me…"

Though he did not say so directly, there was no mistaking the hidden implication in his words and Mika found himself staring at the other boy in astonishment.

"Yuu-chan… do you have even the vaguest conception under God what you ask? Do you realize the thing you will become? The thing you hate most in this world?"

"I do… and I mean it, Mika. I know you are too selfless to admit it, but you want me to join you so you won't have to be alone. I want to be with you until a cure is found and even after we are cured, I'll still stay with you and we can grow old and die together. If no cure is found, so be it, we'll stay together eternally."

Mika was silent for a moment as he contemplated Yuu's words. The other boy may be innocent and even a bit naive at times, but he wasn't stupid and would never ask for something like this so lightly. Yuichiro knew that if he became a vampire himself, he could stay with Mikaela for as long as it took to make him human again. But in exchange, he would be forced to leave Shinoa and the others behind in the never-ending flow of time, and he knew it, accepted it. For his worst fear was not of dying itself, but leaving Mikaela to face eternity alone without fulfilling the promise he had made to make him human again. And he was right, Mika wanted it too, even if he loathes to admit it.

"You won't be able to eat and drink anymore…" Mika began. "You'll never again be able to enjoy sunlight. Or grow and change over time. Or father children and have a family of your own. You'll always be thirsty for blood, and worst of all, you'll have to leave your other friends behind. Are willing to accept this, Yuu-chan? Because you may have to live with your decision for all eternity."

"I know… and I am. All of this, I will bear and more if necessary, for your sake, Mikaela."

Contrary to what Mika thought, Yuu knew exactly what he was asking for and meant it. Even though the thought of outliving his other friends was painful for him, he was still willing because he knew that by compelling Mika to drink his blood the first time, he had condemned his brother and best friend to an ageless, eternal existence, forever thirsting for blood. So it was only fair, only just that he shared the same fate.

And even though Mika himself never wanted this for Yuu, he did promise Shinoa he would talk it over with him because they also had Yuu's demon to worry about too, another reason why it would be logical to turn him. Still, Mika was in no rush to do it. He still wanted to give it a little more time, just to make sure Yuu was absolutely certain and would not regret his decision later since there was currently no known way to make a vampire human again.

Mika smiled as he bent over to kiss Yuu's forehead.

"I love you, Yuu-chan… I'll do anything for you, anything to make you happy. But you have to be sure that this is what you really want because once it's done, I cannot take it back. Please take a little more time to think about it, ok?"

Yuichiro looked a little disappointed with Mikaela's answer, but he had to agree. The decision to become a vampire is not one to be taken lightly, and to his knowledge, no human had ever allowed themselves to be turned by choice.

Nodding his head, he said "I understand, Mika. I will."

Mika smiled, relieved that Yuu wasn't going to push the issue any further tonight and found himself ironically thanking God that his brother wasn't going to argue with him on this like he did everything else.

"Good" he said. "I must go now. Sleep well, Yuu-chan."

"Can I have one more kiss please, Mika?"

The blond chuckled. He couldn't help thinking how cute Yuu sounded when he asked that. At least that was the one thing he could indulge his love in tonight.

"Of course, Yuu-chan, anything for you…"

A/N: Ok, I'm going to end this here. Although I a bigger fan of straight couples, I've decided to indulge yaoi fans with this snippit. This is the first time I ever wrote a story for a same-sex couple so please go easy on me! On a note, its never really been made clear in the OnS manga/anime if Yuu and Mika are straight or not but I notice that Mika does appear to obsess over Yuu like a lover so I'm guessing his feelings for him might lean in that direction.