Summary: AU: Tsuna has always known that something wasn't quite right in his life. Sometimes, he looks in the mirror and sees a black-haired stranger looking back. Other times, he forgets that Nana is his mother, like he wasn't truly Nana's at all. He dismisses all of this as coincidences, but when a strange baby comes to Namimori, Tsuna's intuition goes crazy. Decade-old secrets will come to light, and nothing will ever be the same.

Pairings: Bianchi/Reborn. Nothing for anyone else right now, but I'm open to suggestions. No incest please (Sorry to the R27 and 5927 fans out there) Oh, and it'll definitely be slash.

A/N: This plot bunny has been wandering around my head for a while, so I decided to try writing it and see how it goes. To keep confusion to a minimum, Timoteo will be referred to Nono, no matter who's talking. I know the way I use the mist and rain flames are not canon, but it's my story and I can use them how I want. I chose Chiappone as Reborn's last name as I couldn't find his canon last name and decided to pick one from an Italian name database. I've edited this so there shouldn't be any glaring mistakes, but let me know if I missed anything. The title will probably change at some point. Oh, and the title is Latin for 'Family Above All'

Disclaimer: I do not own the characters or the world of Katekyo Hitman Reborn. Those rights go to Akira Amano.

Prologue

Nono sat at his desk, frowning heavily. Nothing seemed to be going right for him, and Vongola was going to fall apart at the seams if he didn't think of a solution. Two of his best hitmen, Bianchi and Reborn, had a child around a year ago, and they finally decided that they couldn't properly raise a child while leaving on missions. They had told Nono to put them on permanent desk duty, or they would leave and Nono would never see them again. On top of that, Iemitsu found out that he was sterile, and could never have an heir. He'd been inconsolable ever since, and CEDEF was falling apart without their leader. He groaned again, wishing that there was a way to get rid of Reborn's child and get a child for Iemitsu.

Wait...

That was the solution to his problems! He could take Reborn and Bianchi's son, and give him to Iemitsu. It was a sinister plan, and Nono knew there was a chance of it blowing up in his face, but he had no choice. This was going to be a defining moment in his life, and he had to make a choice. Should he rip apart a family in order to make another happy and keep Vongola safe?

As soon as Nono asked himself that question, he already knew the answer. He quickly sent out a message, asking for Reborn and Bianchi to come to his office with their child. It wouldn't be too hard to erase all information about Reborn's family, as Nono had made sure news of Reborn's marriage and subsequent child never spread. Only him and the happy couple knew about little Antonio Chiappone, son of Reborn and Bianchi Chiappone.

It would also be ridiculously easy to force Reborn to stay in his infant form, as he could use his mist flame to erase the information from Reborn's mind. Reborn hadn't told the other arcobaleno about his discoveries yet, as he had been too busy with Bianchi and Antonio to tell them. It also hadn't hurt that Nono had practically ordered Reborn to keep information about his adult form a secret.

Nono decided to use his own mist powers to set everything up as opposed to asking his mist guardian, since less witnesses meant less chances for this secret to escape. Nono would take this act to his grave, and Reborn and Bianchi would never remember even getting married, much less having a son, once he was done with them. It sickened Nono to know that he was stealing a child, especially the son of his two favorite assassins. However, it had to be done, for Vongola.

Nono shook his head to clear his thoughts when a knock echoed through his office, and he beckoned the people waiting outside in. Reborn warily entered with Bianchi and his son in tow, and he softly closed the door to avoid aggravating his son. Nono smiled at them, projecting the air of a kindly grandfather to put Reborn at ease. He waved them into the chairs in front of his desk, and rested his chin on his hands.

"Chaos, Nono. What do you need? I thought I told you that I wouldn't take any more missions," Reborn says bluntly, cutting to the chase. Bianchi gasped and smacked Reborn on the arm, before turning to Nono and apologizing.

"Sorry Nono, but we're just on edge about keeping little Antonio safe and keeping everything a secret. We don't want anything to happen to him." Nono winced inwardly at that, but he covered it up with a smile.

"I know the feeling exactly. I just wanted to see little Antonio before you leave Vongola. You are part of my Family, and I would love it if Antonio came to see me as a Grandfather. Do you mind if I hold him?" Nono reached his arms out, and after a glare from Bianchi, Reborn reluctantly handed over his son. Nono sent out the smallest tendril of rain flame, slowly lulling Antonio to sleep.

"I know I will love Antonio like my own child," Nono remarked, "But I'm afraid you won't. I'm sorry Reborn, Bianchi, but I can't let you go. Ciao," Before they could move, Nono had sent them to sleep. He set little Antonio down on his desk, before getting to work changing his appearance. He also transplanted some of his sky flames into Antonio, as the child had inherited his Father's sun flames and the heir of Iemitsu needed sky flames. This was the most delicate part, as the flames had to accept Antonio. Nono breathed a sigh of relief when it worked, and he went to work altering Reborn and Bianchi's memories.

*****
Later that day, Iemitsu practically sprinted into Nono's office when Nono told him that he had something for him. Iemitsu knew, deep in his heart, that he was going to leave Headquarters with a new family member. He burst through the doors, and his face brightened at the sight he saw. There stood Nono, holding a bundle with little brown tufts sticking out that were the exact shade of his darling Nana's hair

"Is this what you wanted to give to me Nono?" Iemitsu asked breathlessly, his hands itching to reach out and hold the child.

"Yes, this little tyke was found abandoned near my house earlier today. When my guards stumbled upon him crying in an alley, they brought him to me. He'll be perfect as a son for you. Congratulations, Iemitsu." Nono gave him as happy a smile as he could muster, his eyes straying to the direction of the apartments he had placed Reborn and Bianchi in mere hours ago. Iemitsu was too wrapped up in excitement to notice, otherwise he might have been more weary about taking the child. But he wasn't, and so Iemitsu left on the soonest plane to Namimori, child in hand without any idea of who the child belonged to. As far as he was concerned, the child was his now.

Nana would take one look at the child when Iemitsu came home and fall in love. He was named Sawada Tsunayoshi, her little Tuna fish. Nono had told them to keep the fact that Tsuna was adopted a secret, and Tsuna looked so similar to Nana that after several years they forgot that Tsuna wasn't actually theirs.

While Iemitsu was flying home to tell Nana the good news, two hitmen would wake up in their apartments with blinding headaches. Reborn Chiappone would go walk over to his suitcase, only to topple over as he over extended his legs. He frowned and chalked up the sudden bout of clumsiness to the headache, and he wouldn't realize that he simply wasn't used to being back in a small body. Bianchi Chiappone, now Gokudera Bianchi, would look around her room, searching for something she didn't have. Her arms felt cold, as if she had gotten used to holding a child. She shook her head and fell asleep, forgetting about the strange sensation by the time she woke up again in the morning.

A/N 2: Well, that's all I have for now. The next update should be in a few days, since I have nothing better to do. Next chapter will be called Strange Occurrences in the Life of Sawada Tsunayoshi, and it will be a series of short glimpses into his life as he grows up. All of it will be pre-daily life arc. That should begin by chapter 3. Fun fact: the name Antonio means 'invaluable'. I thought that fit rather well. Please review and let me know how it is. Remember, reviews feed an author's soul.

Ja ne,

TMFTLT