You decided to meet with Hinako after school, and you noticed that she was back as a kid again!

(Y/N): Uh ... Hinako?

Hinako: Oh! It's you again!

She ran up to you all excited, and then she hugged you.

(Y/N): (blushing) H-Hello. You know, a lady of your age should be more refined and-

Hinako: You're that kind boy who helped me out before! Tell me, what is your name?

(Y/N): (Y/N).

Hinako: Nice to meet you (Y/N)!

(Y/N): Yes, you too Hinako. So, I was going to ask you about that Happo Yen ... thingy.

Hinako: You mean the Happo Five Yen Satsu?

(Y/N): Yeah! That! How did you learn of it?

Hinako: Well, it happened when I was a-

Her stomach grumbled.

Hinako: Uh ...

(Y/N): Okay, I guess I'll get you something to eat!

A couple of minutes later...

You gave her a whole bag of Konpeito.

(Y/N): Now don't eat it all at once, or you might get a-

She downed the whole bag in one second!

(Y/N): HOLY SHIT!

Hinako: HEY! No foul language like that!

(Y/N): I'm 20 years old!

Hinako: It's still not polite!

(Y/N): Holy crap?

Hinako: Much better. Now then, where was I? Oh yes! It all happened when I was a little girl.

(Y/N): But you are a little girl.

Hinako: A smaller girl.

(Y/N): Oh.

A couple of years ago...

Happosai found a small Hinako in her bed.

Happosai: So Little Girl. You have a weak body?

Hinako: Uh huh.

Happosai: I will teach you a technique that will make you feel better!

Hinako: Thank you Mister!

The old fart continued to train Hinako by pressing certain pressure points of her body to change her metabolism.

This went on for a whole month, and Happosai raised the nurses, stealing their bras and panties, and then using Hinako to drain their fighting spirit and Chi to slow them down!

Happosai: Same time tomorrow, Hinako!

In the present...

You angrily clenched your fist.

(Y/N): Why that lowdown dirty-

Hinako: Are you okay (Y/N)?

(Y/N): Listen Hinako, there might be a way for you to discipline the students and switch into your adult form every now and then when you need to!

Hinako: Really? Will you teach me?

(Y/N): Of course! You seem like a sweet girl!

Hinako: OH THANK YOU!! THANK YOU!!

She gave you a hug and a kiss on the cheek!

Hinako: You're a good boy, (Y/N)! Bye!

She took off!

(Y/N): G-Gosh!

Little did you know; a certain blonde girlfriend of yours saw what happened.

Yang: GRRRRR! THAT KID IS FUCKING DEAD!!!

She marched right to the Tendo Dojo, Cat Cafe, Ukyo's restaurant, and even the Kuno Estate to round up help!