How would you like to proceed? Do you want to simulate a game, or try editing a save file?
Let's say you want to give Emma a romantic ending with Liam. You can edit the save file to increase their relationship value, and then load the save file in the game to continue playing. renpy edit save file link
Keep in mind that editing save files can sometimes cause issues or break the game. Be sure to back up your save files and test your changes before loading them in the game. How would you like to proceed