Dean, being the hunter he was, had despised monsters since the day his mother died. He hated that stupid demon for killing his mother way back when and making his whole family be torn apart and out into the business of hunting.
Although he was forced into it, Dean did like his job. Hunting monsters and other creatures so people could be safe was a good thing, and so he considered himself a decent person. For the most part.
Of course, Dean would never forgive himself for the lives he had to take and the souls he dammed. Every time he killed it always felt like a little part of his own soul was being chipped away by the demons ready to take him to Hell.
These past few months Dean had went through had been nothing but normal anyways.
It all started three months ago. Dean and Sam had went on a hunt. A retired hunter nearby had tipped them off that some pesky vampires were killing some people. The two brothers knew that this was their time to shine, and so they went.
While in the middle of the hunt, Dean had decided to stop by at the local bar. There, he was met with you. Dean was instantly captivated and knew immediately that he had to have you, and that's exactly what he did.
When Dean and Sam had found where the vampires were hiding out, he realized that you were one of the vampires he was trying to hunt. Dean surprisingly took pity on you, letting you run away behind Sam's back. It was a stupid thing to do, but now he was with you.
Dean never understood himself why he got into this relationship, but he knew that he cared for you and loved you. Dean had been seeing you behind Sam's back, and today was like no other. He sneaked you into the bunker, locking his bedroom door behind him securely.
Dean sat on his bed, his feet hanging over the edge. He watched as you sat beside him, a soft smile appearing on his face. "Look, I know you didn't mean to last time..." Dean started, clearing his throat awkwardly to try and not seem nervous. "But could you do it again? Bite me?"