Nothing, if I remember correctly the option was that you fought alongside her or sacrificed yourself for her, and they beat you to a pulp, in any case the NTR is due to the scene of Laura teaching Chloe how to remove her cock and use it as a dildo, the same for her to put it on and become a futanari, although I tell you that it almost doesn't matter which option you choose, it doesn't change anything in the story.