"So, what can big brother do?"
Since Itachi had spoken to him that way, there must be a way to avoid the blindness caused by the Mangekyo Sharingan... But if there was a way, why hadn't he used it on himself, instead waiting to give it to Sasuke after he had activated the Mangekyo Sharingan?
"That's a secret." Uchiha Itachi patted Sasuke's shoulder, "You'll know when the time comes."
"Alright." Sasuke didn't push for answers, he believed that his brother would not harm him—their brotherly bond was as solid as gold, he just had to look forward.
"Then, how did you activate the Mangekyo Sharingan?"
"That's not a pleasant memory, the awakening of the Mangekyo accompanies pain... Now, I actually hope that you never have the day to awaken it."
"Pain is actually about causing a strong fluctuation in one's spirit, right? So, if someone is extremely happy, could that also activate it?" Sasuke asked, startlingly.