Quinn gets a taste of what Rachel has been dealing with for years. Since Quinn has started growing as a person since she joined the Gleeks, empathy and bonding ensues.

Puck was not expecting to see Rachel Berry on his doorstep at 2am in the morning after not having seen her for seven years. He wasn't expecting her to turn his life upside down in just 7 nights either. Puckleberry of course with mentions of St Berry.