Sister 

I resented the casual use of sister 

The way friends would throw it around 

I thought 

Why call someone your sister 

You are not blood 

But one day, 

I learned  

A sister is not just a connection by blood 

It is a bond 

So deep and impenetrable 

My sister 

Those words meant something new 

Yes 

She is my sister 

No 

We are not related 

I had three sisters 

But 

I gained a fourth 

Sister