Use it now.

Jessica's hand moved, knowing her decision even before she did. She would partake. Crossing one hand over the other, she forcefully brought down the injector onto her leg, feeling the cold stab of its needle and the hot feeling of its contents entering her system.

She felt it sweep down into her legs, as it did so, she felt the sting of her cuts and bruises disappear, replaced with vigor, as if she were about to race. Then, another heartbeat, and the it raced up into her core, much to the same effect of disappearing aches, a straightening of her back, and rush of a vigor that demanded to be used. Particularly she felt a rush between her legs, as her inner muscles spasmed, pushing out the last remaining aspect of the brute, and replaced with her own wetness, as the heat dwelled in her temple.

Finally, it reached it her head, which only doubled the erotic heat in her restored body, blossoming pure pleasure in her head, she spasmed as she was overcome by sensation. Jessica closed her eyes as her blood sung in veins, filling her with desire to move and act. Her ears pounded as the treatment took its course.

But all this took her awareness away from her surroundings. She did not notice when the sweet blood entered her system, that all around her, the broken bodies moved, lunging forward on their barely functioning arms, toward her. Toward the blood.