Yechen naturally had his reasons for making this decision.
Jinchūriki could easily become Tailed Beast Factor Jinchūriki because their bodies had already resonated with their Tailed Beasts, so fusing with a tailed beast factor again posed no danger.
But Naruto was different from the others. He had shared an inseparable bond with the Nine-Tails since he was in his mother's womb. His constitution made him the ideal candidate to become the second Nine-Tails Factor Jinchūriki.
Besides, becoming a Tailed Beast Factor Jinchūriki was the most reliable way for Naruto to grow stronger in a short time.
When Minato Namikaze and Kushina Uzumaki heard that Naruto was going to receive a tailed beast factor implant, they rushed over in alarm and firmly opposed it.
Their reason was, naturally, that Naruto was still too young to withstand the immense nine-tails factor energy.
But Naruto insisted, and Yechen gave his assurance, so the couple reluctantly agreed.
Becoming a Nine-Tails Factor Jinchūriki naturally required the Nine-Tails' consent, to ensure the process succeeded without harming Naruto.
Yechen also summoned the Nine-Tails to the site. If the factor energy ran wild, the Nine-Tails' presence would allow them to bring it under control.
"Little Naruto, this was your choice. I've done everything I can to help you. The rest is up to you."
"Thank you, Big Brother Yechen."
"Mm. Eat this."
Yechen took out a Dragon Vein Blood Crystal Fruit. It could temporarily strengthen Naruto's Uzumaki bloodline, which would offer some help during the tailed beast factor implantation.
"Okay..." Naruto had no idea what it was, but he accepted the Dragon Vein Blood Crystal Fruit and bit into it without hesitation. The energy within the fruit immediately flowed through his mouth and into his body.
In an instant, red light enveloped Naruto's body, and a powerful aura