Not imaginary

Many people have had imaginary friends, but they only lasted until they where five or so. People look back on those days and chuckle. But what if you didn't realize that your best friend was imaginary? What if you were in high school and didn't realize that your best friend was imaginary? And what if your best friend's biggest fear was that you would find out??

I got this idea from Google plus. The credit of this idea goes to Asari Street of Google+.