When Nana and Tsuna both looked down where the voice came from, they saw a baby who was wearing a suit with a gecko on Baby's hat. Tsuna immediately after he saw Reborn he was excited, but he decided to fake being surprised and thinking it was a joke.
Reborn then said "Hey I'm Reborn the Home Tutor from the flyer." and a weirdly serious and childish voice. Tsuna then as he faked laughed said: "Huh are you serious, so you were the one who put that flyer in the mailbox is this a prank you're a baby how can you teach me anything." Seeing what is currently happening, Nana left the room to handle the situation by himself as she thought Tsuna could handle it.
When Reborn heard this, he kicked Tsuna on the stomach, but Tsuna managed to dodge the hit from Reborn. When Reborn saw how Tsuna managed to dodge him, he nodded and said: "Hmm seems like you really are a bit skilled like your Father said to be able to dodge that kick even if I hadn't used all my strength."
Tsuna faking his shock and said, "Huh you're surprisingly strong for a baby if I hadn't dodged it would have hurt even with my training, and what do you mean by dad and I don't even need a tutor as I'm already smart at school and have great grades in sports."
Then Reborn said, "Hmm, I heard that you already knew about this huh, kid." When Tsuna heard this, he was genuinely surprised and as he was about to ask what did Reborn mean, Reborn then suddenly transformed Leon into a gun and shot Tsuna with a rubber bullet. And Tsuna fell and laid on the floor when Reborn jumped to his chest and said.
Reborn said "You thought you were a smart kid we've been monitoring you and your little friends since a week ago. When we first observed you kids, we just thought you kids were playing around. Still, even if you did try to use your mist flames kid to illusion yourselves through the 10 generations Vongola was active we had already made a machine that can detect the use of any dying will in an area."
Then Reborn continued saying "Honestly kid we were surprised that you and your friends know all about dying will flame and already knew to use it to this degree already without actual proper training. You even managed to find two more people who had one of the 4 rarest sky flames, the Dust flame to a kid named Shoichi, Frost flames to a kid named Spanner, and your kid the Sky and even rarer that most of your little friends had two types of flames especially you a weird monster who has more than 3 and has magic as well."
When Tsuna was very surprised and nervous as even though he already trained for a whole year, and he thought he was already plenty strong in this world. However, it seems he still wasn't that strong compared to most experts in this world and also Tsuna thought about Yato and his strength; he finally willed himself to become stronger.
As Reborn saw Tsuna's weird look, he smacked Tsuna's head with a transformed Leon in Hammer form. Tsuna glared at Reborn but was hit again on the head and then Reborn said "Don't be a too arrogant kid even if you are talented and can use magic in our world there are many factions that rival the strength of the Vongola familia, And how did you even figure it out huh kid how to use magic and to die will flame and lastly where did you get the rings.
Tsuna felt pressure on the slight aura that reborn was emitting, and Tsuna felt it was more intimidating than his own fear aura. But luckily earlier Tsuna had gotten a new skill from the system which he had thought will be useful. The skill was Deception which cost Tsuna 50 skill points. However, the skill was significantly much higher cost than a normal non-combatant skill in the system but was fairly applicable in many areas.
The skill allows Tsuna to be able to bluff or lie in anything whenever it is gambling or anything; these skills allow the user to make other people believe in any bluff the user makes. The skill had still only had 10% of success as Tsuna had just bought it earlier this day. Tsuna was extremely nervous as he hoped that he would be able to fool Reborn as he used his deception skill to answers Reborn's question.
When Tsuna had told the Bluff using his Deception, it seemed that the skill had succeeded since Reborn jumped off Tsuna. However, it seems Reborn was still suspicious the Reborn if what he said was real and said" Well if what you said was true or not it won't change anything as I'll figure it you later and now I'll tell you the real reason I'm here as a home tutor. I came here to make you the Vongola tenth, based on what Iemitsu had said to the ninth and me he said that ever since you turned 12, you started to become a prodigy due to an incident."
Reborn continued after cleaning his suit as it was wrinkled a bit and said "It also seemed that you have already trained a bit with your friends with and you already helped them unlock their Flames, so I think it's safe to say they're already your guardians. Based on the info we had gathered when you guys trained, you already have the Sun, Mist, Cloud, Frost, Dust Rain. Of course you the Sky guardian, however, you still need a Storm and Lightning guardian, and maybe you will be lucky enough to find the tenth and the last flame in the sky system Aurora guardian in case you didn't know."
As Reborn was saying it, the door suddenly slammed open, and Takeya and Chrome had entered the room saying "Hey Boss/Tsuna-kun Mochida-Senpai had come here again to challenge you for the right to date Kyoko-san again." As they said loudly to Tsuna until they both noticed the Baby with a suit as Chrome was about to ask Tsuna about Reborn Takeya picked up Reborn and saying "Woah Tsuna-san who's baby is this, this baby is even wearing a mafia suit and holding a toy gun to this guy's so cute and cool."