Superheroine's Impregnation III: The Sacrifice

Warning: This 5500 word story contains graphic language and descriptions of sexual acts. Read at your own risk.
Scarlett Flame returns to face the Entity once again. This time, the Entity and it's creations have invaded Earth. Scarlett, unable to combat the powerful beings, is offered a choice. Submit to the Entity, become it's breeding vessels, or the Entity will destroy humanity. How much is Scarlett willing to sacrifice to protect humanity?

Excerpt: At first, the tunnel seemed similar to the bare areas of the platform. Yet soon, Scarlett found herself clearing sticky wet vine-like things out of the way. They grew denser as she entered deeper, farther and farther in. Before long, she was getting an arm or a leg tangled in them. It seemed the more she struggled, the more she was caught up in them. By the time she realized the vines were alive—and actively resisting her efforts to free herself, it was too late. The redheaded heroine was bound by her arms and legs, and powerless to do anything. She heard something sliding behind her. She felt something stick the back of her neck, and she slipped out of consciousness. “