I'm Sorry

This is my contest entry for 's Contest [link]
I made it in a hurry, got to fix it and add in more shading.

The theme was:
I am a sin; cold, hot, cast away, and embraced. I am bright against your eyes, dark against your mouth, steaming against your soul.

When I thought about the theme it remind me of vampires.

Short Story:
Eventhough he is a vampire he loves her, but he needs to drink blood in order to live. He feels bad drinking her bad, but she doesn't mind cuz she loves him.