Disclaimer: I do not own Katekyo Hitman Reborn!

Summary: Sawada Tsunayoshi remembered dying, surrounded by his children and grandchildren. He remembered seeing the light at the end of the tunnel. But then why is he lying on a bed that he hadn't seen for a hundred years? Time travel? No. He doesn't remember having a brother, much less a younger twin. What he remembered was a brief flick on his forehead and a mop of unnaturally white hair. "BYAKURAN GESSO! YOU ARE SO DEAD!"

Prologue: Who is At Fault

Revenge is a dish best served cold.

At least that was what Byakuran Gesso believed in. And that's why he was enacting his revenge right now, after one hundred years. Revenge for what, you ask. Why, for killing him in the what-should-be future.

Oh, he knew it hadn't happen to him and wouldn't happen anytime in the future, but still having your carefully structured plan destroyed by a shrimp who could barely pass school was a huge embarassement. Never mind the fact that said shrimp killed the future him.

There was another reason he was doing this.

He was conducting an experiment. He had recently developed a new aspect in his ability on parallel dimensions. It was a relatively harmless project, but so far it yielded no results.

He hummed cheerfully as he walked through the eerily quiet hallway of the Vongola Mansion. The maids bustled past him and the guards paid no attention to him; he was a frequent visitor after all.

There was a certain blanket of depression that hung about in the mansion. Byakuran knew that he arrived at the right time.

He arrived at his destination still humming. He checked himself out first at the nearest mirror, which happened to be the current security's sunglasses. He looked fine, still not a day out of eighteen (Bless other worlds and their technology).

He smirked then bypassed the security. Pushing open the door, he analysed what he saw.

It was any enemy Famiglia's dream.

All high-ranking Vongola mafioso were inside. From the Eleventh to his Guardians. The current Twelfth Boss. The current Guardians. The family of these men (and women). Allied Family Bosses of the Vongola. Every life that the Vongola touched was there, crowding the room.

One planted bomb and kaboom~! Byakuran thought.

He slipped through the relatives and close friends, remaining unnoticed even by the renowned 11th Mist Guardian (son of one Chrome Dokuro and Kyouya Hibari). He ghosted towards the bed where everybody's attention was focused.

In the danger that was known as the Underworld, it was every mafioso's dream to die of old age.

And Tsuna was one of the few who managed to achieve this wish. He had lived long and outlived all his Guardians and his wife who he dearly missed and loved.

Weak and dying, his resolve still shone bright in the dark. He still had the power and authority as he did in the past.

The body is weak but the soul is not.

Byakuran stood by the headrest of the bed.

Tsuna's eyes briefly flickered to him, and Byakuran noticed the lack of recognition in his ally's eyes.

It seemed that Tsuna was more focused on leaving everyone with his message. To continue his work and destroy Vongola's reputation of violence. To be the vigilante group that Primo had asked them to be.

The light in Decimo's eyes was dimming, and Byakuran knew that if he had to act it had to be now. When Tsuna reached the end, his soul could not be pulled back in. Like that Chinese woman I-pin or that Lightning Guardian. He had arrived just a few seconds late and had not been able to enact his experiments on them. The loud and obnoxious Sun had been his first test subject but up until now, there had been no reports about him.

Byakuran concentrated his flames on his forefinger and thumb, and gave Decimo a flick on the forehead

Decimo's body gave a small jerk then went still. The light was gone from his eyes.

Whatever holding the family gave way. First it was just sniffling then somebody wailed. It started a chain reaction that turned the place into a weep fest. The women openly sobbed in their (at least those who had) husbands' arms. The men turned away to hide their faces and others outright fled from the scene.

The Eleventh Boss pried his arms off his wife's hands and pulled the sheet over his father's body.

"He had lived well. May his spirit rest in eternal peace with his ancestors and Family."

And with that Byakuran slipped out. It wouldn't be proper to laugh at somebody's deathbed now, would it?

Later that evening, the Gesso Famiglia would wonder why Yumitsu Gesso, 'son' of the late Byakuran Gesso was cackling wildly and evilly to himself (Well, not really. Two identical women from Cervello were with him). Nevertheless, everyone felt shiver run down their spines. They swore to never come near their Boss's room that night.

So, how is it?

Review please ^.^