A note to the reader: This was written prior to any explanations of Kakashi obtaining Mangekyo Sharingan. Yes, it took a looong time to get finished.
Hit One: Former Student
Kakashi waited for the right moment to strike. His former student was completely unaware, instead focusing ahead on the scroll on the table.
Kakashi didn't want to use his Chidori, because it made too much noise. He pulled a kunai from his weapons pouch and stalked forward.
The student didn't move. She never knew what was coming.
Kakashi was right behind her now; all it would need was one quick, clean swipe of the sharp blade across her neck, and then, he would have the Mangekyou Sharingan he needed to protect their teammate.
"Kakashi-sensei," Sakura said without turning. "What are you doing?"
Kakashi stopped. Caught. He was caught. What should he do? Kakashi burst into song. "We were both young when I first saw you... I close my eyes and the flashback starts... I'm standing there on a balcony in summer air."
Sakura stared at her former sensei incredulously. "Kakashi-sensei, what are you singing?"
Yamato walked up from behind a book shelf. "Is that a Taylor Swift song?" he asked, with a smile. "I quite like her music." He joined Kakashi in singing the ballad of Taylor Swift's sad love life.
"See the lights... see the party, the ball gowns..." they continued singing, ignoring Sakura's loud protests and threats. She covered her ears, but they just increased the volume.
They were at the chorus now. Sakura took quick action. She had heard this song before, and she knew how long it lasted. Jerking the kunai from Kakashi's hand, she was about to stab him with it, when he twisted her arm and stabbed her instead.
Sakura's eyes widened.
Yamato kept singing.
Kakashi stared regretfully at his pink-haired student, who was staring at the kunai plunged between her bones and into her heart with wide, shocked eyes.
"Kakashi, what have you done?" she asked.
"I'm sorry, but I must protect Naruto. I know you don't want to lose another teammate, so you should understand this. It is our only hope of keeping Naruto safe and getting Sasuke back."
"What is our only hope? Killing me?" she asked, too numb to even consider healing herself with her medical chakra.
Kakashi nodded. "Yes. My best hope of protecting Naruto is to get the Mangekyou Sharingan. In order to get that, someone close to me must die. You should be honored I chose you."
Sakura looked at her teacher disbelievingly. "This... this isn't a joke?"
"No. I'm sorry, Sakura. If it makes you feel any better, you weren't that bad of a ninja. A little useless initially, but much better near the end."
Sakura's last thoughts were, That bastard! He called me useless! I am going to kill him! Shanna- the thought was cut off as she and her Inner died.
Yamato finished the song and looked around, only slightly surprised to see Kakashi supporting Sakura's weight, while clutching his left eye in pain.
"Why is there a kunai sticking out of Sakura?" Yamato asked.
"I had to kill her," Kakashi replied sadly.
"Oh."
"I needed the Mangekyou."
"Oh. Would you like to go spar?"
"Sure. I want to test this baby out."
The two left the library, placing Sakura's body carefully on a table, with a note explaining the circumstances.
I had to kill her. Got the Mangekyou. ^_^ I know you'll understand, Tsunade-sama.
MUCH LOVES, KAKASHI
