You won't give up

In her demonic arrogance, Louisa made an error: her gloating revealed a very important piece of information. Without the third treatment, your vaccine is still protecting you from the virus. Despite swallowing her ichor and saliva, you know you cannot be turned yet. Even with this and your dripping pussy, you know that to waste time fucking Louisa will risk other demons discovering you. Louisa even said she wanted to destroy your heroism and purity; she likely won't risk killing you when you are one treatment from damnation.

You reach for the knife at the small of your back with a disturbingly fast movement. It seems those treatments might come in handy.

Drawing the knife, you swing it downward with a vicious stab aimed at Louisa's thigh between your legs. With your enhanced speed, even the demonic Louisa is caught off-guard in her lust.

With a ear-shattering screech, Louisa releases your throat and clutches at her leg which sprays black blood onto your dress.

"I'm so sorry, Louisa," you say with real remorse as you fix your dress, covering your drenched panties with the bloodstained garment. You spare the demon one glance as you sprint through the doorway and see a look of pure evil in her crimson-slitted eyes.