A/N: Glad to see this story got such a warm reception. This all started out as a possible reason why Nana seemed to be oblivious (in canon) to everything and took off from there. Hope you all enjoy and feel free to leave a review!

Disclaimer: I don't own Katekyo Hitman Reborn or X-Men.


Chapter 1: The Butterfly Effect

When Tsuna was born, there was no shortage of visitors to Nana's hospital room. In fact the only person that hadn't been able to make it was the father himself. Not that Iemitsu hadn't been willing to, the man was in the middle of removing a small famiglia that thought themselves above the older more established families. He didn't want to lead any potential assassins to his vulnerable wife. Little did he know this would come back to bite him in the ass in the future.

Tsunayoshi Sawada was healthy and already had a tuft of light brown hair on his head. His eye were a mix of amber and brown, the girls all cooed at the baby. Rogue wore thick leather gloves and a jacket so she could hold the baby without hurting him. "He's a doll Nana. Just like you." The southern woman praised, Nana gave a faint smile. She was just glad that the X-Men hadn't started a fight with Magneto when he stopped by to check on Nana and her son. The man had a surprising soft spot for children.

"Thank you Rogue, though I'm still worried about his future. I wish my husband had been man enough to admit that he was in the mafia. If I hadn't seen it for myself I never would have known." Nana says, if Iemitsu had been in the hospital room she would have smacked him in the head for his stubborn refusal in involve his family with his famiglia. Especially if their son was going to be dragged into the mafia anyways. Iemitsu's absence would do more harm than good.

"You said he'd get a fire mutation from his father, right? I'm sure the professor wouldn't mind taking both of you in." Rogue offers, Nana shook her head. "I won't deny my son the chance to make friends in Namimori but we'll try to visit occasionally." Rogue shrugged. "Was worth a shot. Ain't no better cook than you Nana."

XoXoXoXoXo

As Tsuna grew up, he was an outgoing child and easily made friends. Nana made sure they often ate at Takesushi, becoming friends with the ex-assassin owner and his civilian wife. Seeing Tsuna and Takeshi interact was adorable and their cooing mothers took plenty of pictures. They often played catch with each other, enjoying the simple act of throwing a ball back and forth. It had been during one of these play dates when Nana felt a vision take over, her suddenly stiff posture and dazed expression worrying the Yamamotos.

"Nana, are you alright?" Etsuko asks, her usual happy demeanor temporarily replaced by an air of concern. It took Nana a moment to bring herself back to reality and gave the woman a shaky smile. "I'll be fine, I've gone through dissociative episodes since I was a child." Nana constantly thanked kami about the new mental disorders that had been discovered to cover up her mutation. She wasn't friendly enough with the Yamamoto family to know how they would respond to her being a mutant.

"So this is where the Swallow has hidden away. He should have known better, no one ever leaves the yakuza life peacefully." A shadowed figure says with a dark chuckle, their partner nodded in agreement. They were in front of what looked like the doorway to the Yamamoto house. One of the men knocked on the door, a surprised Etsuko answering the door. Her eyes widened in horror as she saw their guns, only able to scream before her body was littered with bullets.

The vision had left Nana shaken, wondering when this attack would take place. Did she have any right to interfere with what fate planned for the woman? She watched the woman laugh at something her husband said. No, she couldn't bare to see a family devastated by the loss of such a kind and accepting woman. "Tsuyoshi, may I speak to you for a moment?" Nana asks, her expression solemn. Tsuyoshi looked surprised but agreed, leaving Etsuko to watch the boys.

"Does Etsuko know what you used to do for a living?" Nana asks, Tsuyoshi tensed. "It doesn't matter, I've retired." He growls, Nana placed her hands on her hips. "Well obviously your former employers haven't forgotten about you and I can't stand watching what fate has in store for your family." She says, Tsuyoshi's eyes narrowed. "You're part of Vongola like your husband, aren't you?" Nana shook her head. "He has no idea that I know about what his job really is. I only know this because I… can see into the future of those that are close to me." Nana admits.

Tsuyoshi's eyes widened. "You had a vision earlier, didn't you? That's what put you into that strange trance." Nana nodded. "Your former yakuza associates are planning to murder you and your family in cold blood. So make sure you and your wife don't open the door to any strangers." She advises. "I wish I could do more but my powers are limited to observation only. And even then I don't get as much information as I'd like."

Tsuyoshi place a hand on her shoulder, shaking his head. "It must've taken a lot to admit this Nana, and I'm glad that you trusted me with this information." Tsuyoshi says, already thinking of ways to deter anyone from invading his home. Etsuko was always hounding him for a better home security system, so it wouldn't be suspicious to suddenly have one installed. "Mama!" Tsuna ran over with a grin, his body covered in dirt and with grass stains on his shirt. Nana sighed, it was going to take forever to remove those. At least it wasn't blood, she had way too much experience removing those type of stains.

XoXoXoXoXo

A week later, those same men in Nana's vision tried to break into the Yamamoto residence. They were taken out by an "upgraded" security system and Tsuyoshi's impressive instincts. Unfortunately this meant that Etsuko learned of Tsuyoshi's former profession and was chewing the man out for not telling her about it.

"We could have been killed! When we got married, we vowed to take on the world together. That includes your dark past." Etsuko scolded. Thankfully Takeshi was at the Sawada residence, unaware of the argument his parents were having.

Tsuyoshi felt his eyes water, sobbing into his petite wife's shoulder. He thanked the gods that he had such an understanding wife. "Remind me to give Nana free dinner for life." He mumbled, Etsuko laughed. "Whatever you say honey. But no more hiding things from me or you'll be in the dog house. I will build the damn thing myself if I have to." Tsuyoshi didn't doubt that she would.