Shining Armor loves his Little Sister, in more ways than what the "law" permits. But who says that the "law" or even Twilight herself should be able to deny him his desires?

This is a derivative of "Not Now Big Brother..." by Darf. I'd strongly recommend you read that first.

Warnings: This is a M/F foalcon rapefic, if that doesn't interest you proceed with extreme caution.