Doomsday: I was reverse-raped by the mature woman next door at the start of the game.

[I've transmigrated, and a zombie virus has broken out!]\nLin Yuan: "...Such a hellish start?"\n[Starting at home, temporarily safe. My childhood sweetheart is a goddess who has secretly loved me for many years!]\nLin Yuan: "Hmm?? Talking about this makes me wide awake!"\n[Awakening the Petting System, I can pet anything. Petting creatures kills zombies, earning points that are then used to level up!]\nLin Yuan: "Not bad, not bad, this cheat is pretty good!"\n[The mature woman next door is infected with the zombie virus, I can pet her!]\nLin Yuan: "Hmm? That works too?"...