Excerpt from my latest Sasstrology article (please leave comments on the Sasstrology site):
"In a previous article about the 12th House, I described how someone’s planets falling here gives them access to a side of you that no one else sees. But a 12th House synastry overlay can also mean a release from your personal prison. This house represents surrender, and often it’s the strength of your denial that keeps you locked in. The person who activates this house has the key to your release."