Banging the Basilisk (Reluctant Monster Sex)

The doctors tell Eve that her father has fallen comatose from an unknown poison, with recovery unlikely. But she learns of one final possibility: the anti-venom of the legendary Basilisk. With no other options left, she descends into the sewers of New York, hoping to pilfer some venom from the beast without getting killed. But what will the Basilisk want in return?

This 6500+ word story is intended for adults only, and includes giant snakes, monster sex, and an offer you won't be able to refuse!

“You must relax, Eve. I have no interest in killing you.”
Huh?
“In fact, I want nothing more than to help you... as long as you can return the favor.”
I sat upright, eyes still shut, hoping to direct my voice toward him. “Anything you want.” I wasn’t sure if I could trust him, but if I couldn’t, I was destined to end up dead anyway.
“Oh, I am so pleased to hear that,” said Käärme. “Because only you can give me what I want.”
A thick knot was stuck in my throat. My heart was dropping onto my stomach. My palms were wet.
“Only... me?”
“Yes, Eve. Only you.” His voice was cool rain in heat.
There was a feeling in my chest, indescribable, but growing, and I knew it wasn’t good.
Then there was a slick, smooth appendage gliding up my leg, curling around it like a vine, daring to go past my knee, reaching the insides of my thighs, curious if I would ask it to stop. And suddenly every single part of me knew what Käärme wanted.
Only you.