My sissy's initials are "pg" in real life. It's what initially led me to call her my "pantiegirl."
Professionally, we worked together before I married her. In public I began calling her "pg." It's not unusual for people to have nicknames that match their initials. The nickname began to stick and soon, most everyone in the office was referring to my pantie girl as "pg." Of course, only I knew what it meant.
But that didn't last long. I had a couple of very close friends that I eventually shared the secret with. They were people that I could trust and to this day, they've not breached that confidence.
At first my sissy didn't know that I'd shared this little secret with them but not long after our engagement was public one of the friends let her know about it with my permission.
"Hello pantiegirl" she said to my sissy one day while passing her in the hall. My pantiegirl blushed redder than the pair of panties she had on that day.
There was no one around to hear, and Nancy let sissy in on the secret.
"What color are you wearing today" She asked my sissy. Sissy hesitated at first but eventually told her.
It became a game. Nancy still plays it today. It's a simple game.
Nancy asks "What color?"
Sissy lets her know.
I'm so proud of my pantiegirl.