"You don't need a reason to help people."
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People always wonder how Tsuna was able to make Rokudo Mukuro, a Vendicare ex-convict and one of the most feared man in Italy, joins his side.

When asked, the Decimo would only smile and say, "I merely gave him a choice. That's all. It was him who chose to be with my family." And people will marvel at the Decimo's kindness.

Now, if one who was brave or perhaps, foolish enough to ask Mukuro this question, they will most probably get a mind-spinning answer and no honest answer.

But.

If Mukuro was to be honest, he would say that the moment he chose to be with Tsuna was when Tsuna was able to free him.

Mukuro still remembered the short conversation that they had after his release. It was short and simple. But to Mukuro, it may probably be one of the many reasons why he was attracted to Tsuna.
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"Kufufufu. Why did you help me?" Mukuro asked after he taken over Chrome's body.

Tsuna only looked at his Male Mist Guardian and smiled. "Because I wanted to," he answered.

Mukuro narrowed his eyes at Tsuna. "Why?" No creepy laugh. Telling Tsuna he is serious.

Tsuna gave a soft smile. A smile not out of pity, but simply a smile of relief. "Does helping people need a reason?" he asked back.

Mukuro went silent before his lips quirked upwards. "Kufufufu. It seems so." Mukuro said before leaving Chrome's body.
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Until now, whenever Mukuro remembered it, he would chuckle softly before dissapearing in thin air. And if Tsuna caught him chuckling, he would only look at Mukuro and smiled, amused.