Karma has a what!? (Assassination Classroom Fanfic) (Karma's little sister~)

Karma-kun has a what!?

In the forest:
Irina Jelavić aka Bitch-sensei was walking down the road when she heard footsteps near the forest along with the occasional weeping.
"Someone is being awfully loud"... Irina thought. As a professional hitwoman, she got a gun ready to shoot and took a few steps towards the noises.
What she didn't expect is what was in front of her. "Now what do we have here" she thought as she carefully put the gun away to not scare the person in front of her.

Class 3-E :
"This lesson is now over. Please stand" Korosensei said. Everyone in the class but Karma stood.
"Bow"
"FIRE" yelled Nagisa as the class quickly took out their guns and fired at the octopus.
"-sigh- Oh my, you already tried this trick before." Korosensei said as he effortlessly dodged the BB bullets.
Suddenly the bullets started to hit each other cause and unpredictable path. The students went under the desk to avoid injuries yet kept firing. A smoke bomb was near Korosensei tentacles and exploded with a sticky substance.
"Not enough to assassinate me" Korosnesei mocked as his face was striped.
"Hmmm hehe a lot has been put to use today" Korosenei said.
Then everything stopped. They ran out of ammo . "Darn I thought we had him" a student said. "Not enough ammo." Nagisa said.
"Nice try though class. You have a lot to improve though. " Korosensei said as he advised the class on what to do. "Now clean up the ammo. Your English lesson is next"
"We'll get him next time!" Kayano said. Murmurs of agreement followed. They continued to clean up the classroom.
"Bitch-sensei is coming. Just in time too" Rio said.
The door slid open and walked in Bitch-sensei. "Morning brats"
"Good Morning Bitch-sensei!" yelled the class. Irina grew a tick mark. "Don't call me that!"
"Anyway, we will have a guest today. Come in sweetie. If they hurt you, tell me so I can punish them properly alright" Irina smiled sweetly much to the class confusion and horror.
What!? Bitch-sensei is being nice!?
Who is the guest!?
Bitch-sensei is acting weird!!
Small, quiet footsteps were heard and walked into the classroom with the face hidden. The small girl had bright red hair tied into pigtails held by white ribbons. She latched onto Bitch-sensei leg and hid behind her.
"Come on sweetie, introduce yourself. Then you can sit on my chair and stay there for the lesson." Bitch-sensei said shocking her students who never saw this side of her. Karma was watching the girl with eyes narrowed.
"Um...." A quiet voice was heard behind the teacher's leg. "M-my name is..." A red face peeked out and a loud sound was heard from the back of the class.
"Huh!? Kiyoko!?" Karma shouted as was standing from his desk. His face shocked.
"ONII-CHAN!" yelled the red hair girl as she ran out of Bitch-sensei legs and hugged Karma. Her height only allowed her to reach to his knees.
Total silence...
"EHHHHHH!!!?!?" yelled the classroom.
Outside of the classroom:
"What a turn of events" said Korosensei as he sipped his tea that he got from England.