What's going on here? (A teaser from ThePromise)

He didn’t smile at my joke, backing me into the room and locking the door. The look he was giving me, for some reason, made me think of Talking Head’s “Psycho Killer.”
“You know, I don’t think I’ve told you how thankful I am for how great you’ve been to me.” He fiddled with the knife, cutting a narrow line into the top of the dresser. “You accepted me, vampire and all.”
“Laylen,” I said, my voice gentle. “Just because you’re a vampire, doesn’t mean you’re bad.” I placed a hand on his arm. “You’re good and you need to start thinking that about yourself.”
His gaze moved to me, bright blue and beautiful. “Still … you trust me?”
“Of course I trust you,” I said. “Sometimes I trust you more than anyone.”
His lips slowly crept up. “I know you do.” He lazily moved in front of me, running his finger down my bare arm. “You know I never thanked you for that day in alley, when you saved me from dying. Letting me bite you like that, it was really amazing.”
I grew uncomfortable, remembering the bite and all the feelings that came with it. My skin warmed, my pulse quickened, and I knew he can sense it. “I couldn’t let you die.”
“You could have.” His fingers grazed my wrist, resting on my vein. “You didn’t have to let me bite you.”
“Yes I did.” My voice came unsteady.
He rubbed his lips together, touching my wrist, watching it with passion.
“Are you okay,” I asked, trying to catch his gaze. “You seem kind of …”
His eyes met mine. “Kind of what?”
I swallowed hard. “Off.”
Something in his expression sent a chill down my spine. “Off how?” He trailed his hand to my cheek, gently stroking my skin. “You’re so beautiful.”
Most girls would have been flattered. But I knew better. Something was wrong. I grabbed his hand, trying to lift it from my cheek. “Laylen … I don’t think—“ He put his hand across my mouth.
“Stop talking,” he said and the dark shift in his eyes wound a knot in my stomach.
Suddenly, his fangs slid out, like murderous blood seekers, wanting to devour me. I tried to pull away, but he snatched my wrists and crashed me into him. His body was ice-cold and so were his eyes. He breathed in my neck, his breath warm against my skin. “You smell so good … I just can’t … can’t …” Then his fangs sunk into my neck.
I struggled to pull away, but he was a vampire and a Keeper and much stronger than me. He shoved me to the bed and I screamed as his fangs dipped deeper.