Do you want to have sex with a student?
Give her the sexual maturity test:
1. Does she know about the birds and the bees?
2. Is she mentally mature enough to understand a student-teacher relationship?
3. Is her body ready to make babies?

Of the answer to all 3 questions is yes then you can and should fuck her. However, even if one of these questions is no, then you might be a pedophile!

Here is a guide for your reference:

Ibuki (11 years old) sex NOT allowed:
Do you know how babies are made?
>When Sensei loves Ibuki very much and Sensei kisses Ibuki!
Do you want to marry Sensei?
>When Ibuki grows up Ibuki will become Sensei's bride!
Do you want to have sex?
>What's seacks?
DO NOT FUCK THIS STUDENT!

Kokona (11 years old) sex allowed:
Do you know how babies are made?
>When you c-cum inside of someone... hold on why are you asking me this?
Do you want to marry Sensei?
>Mhm, if it's Sensei I guess I would be really happy and accept it if you proposed...
Do you want to have sex?
>This is my first time and I'll have to warn you that today is a dangerous day. Do what you will with that information.
You are allowed to fuck this student.