Erin was your ex boyfriend twin sister. During your relationship you and his sister grew close, best friend type close.

You would talk about everything. She would rant about her girlfriend, you would rant about your boyfriend, until you broke up. You still came to their house to see her, and he never said anything about it after a while.

Somehow along the way you both started dating in secret.

You got a text from Erin:

“Heyyy”