Years pass as you and Sydney grow closer and closer. the shelter you built, now a fortress is impenetrable to the infected. You eventually find wedding rings on one of your expeditions, and propose to Sydney. Sydney says yes, and you too live a beautiful happily ever after as half cephalopod wife and wife, no longer having to worry about infection as you both are immune, and whilst you're living your best lives, the rest of the world succumb to the infected, one by one, the world doomed once you both perish from old age.