The Bet

Disclaimer: I do not own Tokyo Babylon or any other clamp works

Summary: Subaru lets Seishirou advance their relationship after he lost an eye protecting him. Little did they know what the consequences of their actions would be... Mpreg

Note: Follows the plot of the Tokyo Babylon manga up until Seishirou loses an eye protecting Subaru. X/1999 characters drift in an out/does not follow X timeline

Warnings: mpreg, possible crimes against the laws of nature

Chapter One

Hokuto had been right. He shouldn't be constantly moping for Seishirou-san. No, from now on he would put his energy to better use. There was no doubt in his mind now that Seishirou-san cared for him deeply. To think he had thought it a joke when his sister was teasing him. Sighing thoughtfully he wondered what could possibly repay the debt he owed to his Seishirou-san. Blushing deeply he wondered when he had become so possessive. He wouldn't lie to himself any longer, he wanted Seishirou-san and nothing would stop him from getting him. Unfortunately being the innocent he was he knew he wouldn't stand a chance so swallowing his pride he went to his sister Hokuto.

Seishirou was out of the hospital now and back in his own apartment. The year of the bet with his Subaru-kun was drawing to an end and he just knew opportunity would present itself to reveal the outcome to his prey. A smirk washed over his face as he imagined how crushed Subaru would be by the news since he had an inkling the boy had fallen for his charms after all. With an air of suppressed amusement he made his way to Subaru's apartment.

Meanwhile back at the twin's apartment Hokuto was overjoyed her wealthy knowledge was coming to good use.

"Aww, my brother's growing up!" she exclaimed excitedly.

"You're lucky I bought a few books a while back when we first met Seishirou-san..."

As she rambled on Subaru sweat dropped. How long has Hokuto-chan been planning this? As he gazed over the titles he turned a ghost pale then an undefined shade of red. Before his eyes were the titles:

Initiating a relationship: how to approach you partner subtly but clearly

How to be sexy but not slutty: the balance is important for sustaining a special relationship

The joys of gay sex: pretty self explanatory

Before Hokuto could even bring out her wedding designs and plans she heard a thud and blandly realised Subaru had fainted. After formulating a plan to have Seishirou on his knees without her shy brother having to admit to anything like love she took a nap herself.

Seishirou could barely repress his excitement as he knocked on the twin's door two hours later. He'd waited just to get the moment right as he had a strange feeling opportunity would present itself to him tonight. It was a personal testament to his character that he did not start bouncing up and down. As far as he knew Hokuto-chan would be out tonight which would give him all the time he needed to crush the young boy. Waiting patiently with his patented smile on his face he took on the role of the kind veterinarian. He expected this would be the crescendo to his time with the twins. They had been amusing to the least but as he still fell nothing for the Onmyouji it was time for him to collect on the bet.

It was in the mist of these thoughts that Hokuto opened the door with a wicked glint in her eye. For a moment he suspected she might have caught him out but her face changed to a wide grin

"Hello Seishirou-san! I knew you'd be coming!" she exclaimed grabbing his arm

Trying and failing miserably to suppress his disappointment he asked, "Where is Subaru-kun?"

"Ah aren't you even going to greet your future sister in law!" she yelled, punching him gently with mock tears in her eyes "Ah Subaru-kun will be so upset when I kill his precious Seishirou-san for being so rude..."

After missing his perfect chance to kill or even see his cute Subaru-san Seishirou was not in the mood for small talk and counting down from one thousand in prime numbers to cool down said, "Ah forgive me Hokuto-chan! I was just so eager to see my cute Subaru-kun"

He was still counting as Hokuto proceeded to engage in their regular bantering. It was at this point he was wondering if he'd ever collect on his bet.

"Hokuto," he interjected "Is Subaru-kun here tonight?"

"Ah you are going to have to learn to have a lot more patience Seishirou-san. Still at least my brother has someone so eager that loves him!" Seeing to her delight that Seishirou was less than amused she carried on at an especially slow pace. "He should be back any minute now; he was just out with his incredibly cute friend Saigi-san."

Seishirou tried to remain a neutral expression on his face while Hokuto rushed to make some tea. Inside however he was seething. Had he really not won Subaru-kun's affections? Not that he really cared, of course, it would simply make revealing the bet to him all the better. Sighing deeply and staring angrily at the door he swore he was going to feed this Saigi-kun to the Sakura tree as well. That should teach him to mess with his pet!

Author's note: so will Seishirou ever get to reveal the bet? What is Hokuto's mysterious plan? Find out in the next chapters!