"Why, isn't it obvious, dearie?" Erika asked, looking back with a blank expression. "We're the same age. We come from the same place. We're wearing the same amulet. We have the same mane. The same eyes. I was adopted."
There was something dark stirring in her chest as she spoke the last sentence. Two earth ponies, keeping, of course, the earth pony. Unicorns are worthless in Colterea.
She felt hate overtake her for the first time in her life. Desire to kill, hurt, and silence this mare, her sister, for being better in their parents' eyes.
Erika frowned, and the emotion disappeared. She disliked it. Strong emotions were disgusting.
"Say what you must, but it's quite obvious."