Affinity

The three of them went in.

"I'm home," Sakumo announced when he entered his house.

"Welcome back, darling." A woman came out of the interior of the house.

She had blonde hair and was in her mid-twenties.

She hugged Sakumo and was about to get back but Sakumo held her and was about to kiss her.

"Hey! There are kids here." She put her hand on Sakumo's lips and stopped him.

Sakumo then released her and she looked at Yukan and Minato.

"Hello, my name is Myu Azawa, I am Sakumo, your sensei's wife. Nice to meet you, kids." The woman introduced herself.

After her, Minato and Yukan introduced themselves one by one.

After the introductions were over, Sakumo took Yukan and Minato to a room.

"This is the room where I stay most of the time with my son Kakashi. He is currently sleeping in the cradle right there, you both can see him if you want to but don't wake him up or you will put him back to sleep." Sakumo said while pointing to a wooden cradle on the left side of the room.

"Stay here, I will get the papers from the other room." Sakumo left the room after putting down his blade.

Yukan and Minato were curious about how cute Kakashi was for their indifferent sensei to talk about him all the time.

"...Hey, he's cute," Yukan said in a very low voice.

"Yeah, damn cute," Minato replied in the same voice.

"I told you guys, he is very cute." Sakumo's voice came from behind them.

They were about to shout after getting scared but since they did not want a crying 4-month-old baby in their hands, they did not react and just turned around.

When they turned around, they saw Sakumo holding a thick bunch of paper.

"Sensei, don't tell me, the one chakra paper is mixed in this bunch," Yukan said.

"Well, yes. Not only that but the main point is that you have to find it alone. Since I and Minato already know our affinities, we cannot infuse our chakra on every piece of paper. What if we use chakra paper? There will be none left for you." Sakumo told Yukan the happy news.

"...WOW!" Yukan exclaimed.

"All the best Yukan, I'll just lay in the corner and take a nap." Minato patted Yukan's shoulder and went into a corner.

"Me too." Sakumo followed him.

Yukan sighed.

He sat down and started to pour his chakra into the sheets of paper.

After pouring his chakra into 486 sheets, one finally reacted.

By this time, two hours had passed and Kakashi was taken out of the room by Myu and Minato and Kakashi were no longer taking a nap but sleeping blissfully.

When the paper finally reacted to Yukan's chakra, he shouted," I got it."

Sakumo suddenly woke up and said," Where's the enemy?"

"Enemy? No, sensei, the paper finally reacted." Yukan said with his voice filled with happiness.

"Oh, just that? Well, what is it?" Sakumo asked with his eyes still half-closed.

By now, Minato had also woken up and looked at Yukan.

The paper in Yukan's hand was burning, it gave a black colour for a second and then then the paper turned into ashes.

Sakumo was surprised when he saw a flash of black flame. He touched the ashes of paper which should still be hot after getting burnt.

Sakumo quickly retreated his hand and shook it sometimes.

"Was it too hot?" Yukan asked Sakumo.

"No, it was… cold," Sakumo said while looking at his finger getting purple.

"As far as I can guess, you may have the Yin element too. Since it represents coldness so it may be possible but right here, there are many possible contradictions so I am not so sure." Sakumo said while thinking about Yukan's element.

After some time of silence, Sakumo spoke again.

"Anyways, we will find out about it later on. From tomorrow on, your training time will be doubled. Yukan will learn about the use of sharp weapons from me and as for Minato, you will learn fuinjutsu from a teacher. Just give me some time to find a good one. Now, go back to your homes and don't disturb me anymore." Sakumo said as he yawned and went back to sleep.

Yukan and Minato got up and left Sakumo's house.

-The next day, training grounds-

"Before anything, I will give you guys a short lecture on discipline. Do you guys know who is dangerous, a talented man or a hard-working man?" Sakumo asked the two.

Both of them shook their heads.

"A hard-working man is more dangerous. But, do you know, who is more dangerous than a hard-working man? A hard-working man who breaks his targets every day, with discipline. You cannot train for 100 days and say that you cannot do it anymore on the 101st." Sakumo said to motivate his students to work hard.

"Now, run 35 laps of the ground, do 130 push-ups and 150 sit-ups," Sakumo said while clapping loudly to wake his students up and hype them up.

2 hours later, after Yukan and Minato had done every exercise Sakumo had told them to after the previous ones, they stood under a tree, breathing heavily and drinking some water.

"You boys did well. We will increase the target tomorrow." Sakumo said.

"Anyways, I brought these jutsus for you, Minato. There are 3 D-rank ones and one C-Rank. They are all of the Wind element. Learn them first and then I will get you some for the water element. Yukan now come with me, you are going to train with me, Minato is going to train alone." Sakumo said as he walked to the middle of the ground and took out a wooden sword.

In the middle of the ground, Sakumo stood holding a wooden sword and opposite him stood Yukan with his unsheathed Katan, pointing at Sakumo.

"Are you sure Sensei? I am not as bad as I was 2 months ago." Yukan looked at Sakumo doubtfully.

"Yes, come at me, I will show you how one can win using skills with no extra physical power when against raw physical power, which you will be using," Sakumo said as he indicated Yukan to start the spar.

The spar started and Yukan was ready to suppress Sakumo as much as he could for once in his life.

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A/N: At first I couldn't decide whether to put in Yin or Yang element with fire since a Kijin's physique is strong but Benimaru also has Black flame so in the end I put the Yin.