Disclaimer: I don't own Kuroshitsuji or any of the characters.

It started on a day like any other. Sebastian was busy cleaning the library, dusting each book carefully. The butler was on the last shelf when he felt that tickle in his nose. Pausing, he waited for it to disappear before continuing his work. A couple minutes later however, it came back, and before he could try to stop it he found himself quietly sneezing against his arm.

A bit taken aback, Sebastian paused once more, now in thought. He never broke his image of the perfect butler, that means he never yawned, snorted, hiccuped, burped, coughed, and he most certainly didn't sneeze. He decided to drop it, and blamed his unseen action on the dust of the old books.

A little while later, while Sebastian was preparing dinner alone in the kitchen, he felt an itch in the back of his throat. He quickly cleared it, focusing on his work once more. It came back a few seconds later, and knowing what was coming, the butler covered his mouth and turned away from the precious food, keeping it sanitary. The cough was small and almost inaudible, but very uncharacteristic of the butler once again. He knew he couldn't just ignore the misshapes that had happened, even if they were small. Demons do not just cough or sneeze. Oh yes, this could be the beginning of something terrible.

Sebastian only hoped for the best as he put the issue in the back of his mind.

Early the next morning, long before anyone else was up, Sebastian felt the first big sign of his sickness. During the night, the demon rarely slept. Instead he focused on odd jobs to keep him occupied. This was one of the few time he could relax, and take his jacket off.

As Sebastian was refilling the water in the icebox, he was faced with a sudden but harsh coughing fit, one of which he couldn't hold back. It didn't last long, but his throat burned when it was done, and his breathing had gotten heavy. The butler felt drowsy, and when he straightened himself his head swam. It was certain now.

The demon had contracted an illness.

Sebastian headed to his room to think about what to do. He wasn't sure what he had or where he had gotten it, but he knew it could interfere with his work. If what had happened in the icebox happened in the company of another, especially his young master, he would disgrace his butler name and fail his job. He couldn't let that happen.

Luckily, humans couldn't get a demons sickness. Its a good thing too, because a demon's illness is many times worst than a human's and would undoubtedly kill something so frail. However, a demon's sickness is much longer, and Sebastian had yet to learn what exactly it was he had. Hopefully it was just a cold, but it was to early to say.

Worst case scenario, he had DS03. A sickness that started as any common cold, but lasted much longer, and had the worst kind of side effects.

Hopefully that was not the case.

Sebastian checked his precious pocket watch that his young master has given him. It was almost time to wake the other servants. The butler inhaled, and realized he was a bit congested. He quickly blew his nose and held down a cough before starting his undoubtedly long day.