Find the game on your computer, then copy the incest_patch.rpyc and incest_patch.rpy file into the following 'game' directory (PC: SisterlyLust/game or MAC: SisterlyLust.app/contents/resources/autorun/game). 

- OR -

Open the developer console by pressing Shift+O and type: set_special(True)

This will restore the game's original incest content.

Content Changed
The patch works on all Sisterly Lust releases starting from v0.33. The patch restores all incest content that is currently censored in the standard edition of the game.