A survivor that happened to pass by

You spot a survivor in hiking gear, carrying a heavy backpack. It's a young woman, wearing khaki short shorts and a rolled up shirt, with grabable breasts but otherwise small stature. She has ginger hair that is tied up in a ponytail. She's looking at a map, and hasn't spotted you. A perfect host for more spores.

You sneak closer, your new cock throbbing with excitement to release its load of spores into something so soon. You step on a twig that alerts her to your presence, but it's already too late, as you lunge, sending her to the ground with your arms around her legs.

"Oh god, no! Stop! Somebody help!" But there's no one around, and if there was, they wouldn't dare to risk saving her. Even the infected avoid these parts of the wood, for the same reason. You tear at her, ripping a hole in her shorts, revealing her panties which you move to the side. She has a smooth fuck hole, and though she's struggling, it's wet and dribbling. She wants this, doesn't she, somebody filling her, somebody fucking her, somebody releasing a big, fresh batch of spores in her snatch... that somebody is you.

"Get the hell off me!" she whimpers, but she realises she's about to lose, "Please, not like this..." You inch your cock into her cunt, and your member quickly expands inside her, filling up her cavity. She yells in pain, no doubt that the sudden invasion is excrutiating. You thrust and thrust, filling her air tight with your cock, and she squeals like a pig, tears streaming down her cheeks. You orgasm and release a cloud of spores that quickly takes root inside her, and you shudder in delight at your handiwork. She hollers herself hoarse as the fungus slowly spreads up her thin girlish figure, transforming her ass, her belly, her breasts, into pinkish growing grounds for sprouting shrooms.

"Mother, I'm sorry... I'm sor... sorry... I... need to... release spooooreeesss... Ssssssppppppoooooorrrreeeesssssss...." She moans between clicking noises. You get off her, your work done, your spore cum dripping from her stretched cunt, the shrooms already growing her a nice juicy mushroom cock.

You both head off to cum and infest anything you can get your hands on, and that's what you do for the rest of your lives.