Rachel accidentally meets the other Anderson.
“I saw the guy at your house, Blaine,” said Rachel as she sat down. She looked over at Kurt, still at the counter getting his and Blaine’s coffee. “I don’t want to break Kurt’s heart by telling him, so I urge you to be honest.”
“Guy -“
“Older, blue eyes, shirtless when I when he answered your door?” said Rachel. “Look, cheating on Kurt is not the thing you should do right now, or ever -“
“Rachel,” sighed Blaine.
“All I’m saying is -”
“Rachel,” said Blaine, firmer and gaining her attention. “That guy is my older brother, Zack.”
“Oh,” said Rachel. “Oh!”
Blaine shook his head, a small smile on his face.