Go for the shotgun

You walk closer to the body. Poor guy, his last moments must've been perticularly gruesome, as a look of utter horror is frozen on his face. You say a silent prayer under your breath, and you reach for the shotgun. After all, he's not going to have to use it anytime soon. There's a sudden noise of grass being stepped on coming from behind you.

It's an ambush! A small group of infected lumber from around the corner, and some more pour out from the houses from across the street, all of them advancing towards you at a quick walking pace. Darnit. Even with your newly aquired weapon, your chances of fighting this one out is pretty low.

And then you see something that really terrifies you. An enourmous monstrosity leading them from behind, three of them somehow fused together, two females and a male, one of the females seems to be more recently turned than the rest as her skin still retains some of its previous color. The other two bodies seem to be writhing, their arms pleasuring themselves, a form of constant chittering and orgasmic moans. And it spoke, their voices combined to form an unnatural voice;

"Joiiiiiin... usssss... (Join us, yes! Yes! Join us!)"