Upon hearing this, Kakashi quietly breathed a sigh of relief.
He had originally worried that Shinichi would reject him, yet he had also feared that even if Shinichi agreed to teach him, he might impose some harsh and nearly impossible conditions.
Yet at this moment, Shinichi merely asked for the derivative jutsu of this technique in the future. To Kakashi right now, this condition was ridiculously low, practically amounting to free instruction.
Chapter 107