You first Extract the RPA files using
UnRen.bat or
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now you have the RPYC files but those aren't readable as you'll notice if you try to open one that's where
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comes in, drag and drop the files into there then download the RPYC, when you do they'll become RPY files, those you can modify with something like
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which I personally use. The file you want specifically is "home_harem_samantha.rpyc" located in "ch" ->"harems"->"home"->"events"(not "ev" that's the pictures). The line of code you want to modify for the chance is at line 218.
Also make sure to delete the RPA files seems those take priority when running the game.