My Sister Sato

I have a younger sister, whose name is Sato.
My name is 沙耶 (Saya), and her name is 沙都 (Sato). We have same character in each name.
Our names are very similar, so it is clear that we are sisters by our names.

Sato and I are like best friends (at least, I think so).
We can talk everything, include something we cannot talk to our parents.
We sometimes have quarrel, but after 10 minutes or so, we soon forget about it.

Sato is now 17 years old.
Next year, she will take the entrance exam for universities.
She says she want to go to the university in Hokkaido, so maybe she will live in Hokkaido by herself. I must feel really lonely, but it's her dream, so I want to back her up.