For @gaytillthedeath, who asked for Coldflash, Dark Barry/Vampire AU. 

Barry felt his lip curl up at the side as he stalked closer to the human. His nostrils flared as he took in a deep breath, eyes fluttering close as he came to a sudden stop as the sweet, untainted scent of virgin blood flooded his senses. After a long moment of standing still, taking in the scent, Barry’s eyes snapped up, eyes bleeding red as he began to walk 

“Wha-what are you going to do?” Len asked, his voice cracking as he tried to push himself even further into the wall behind him.

Barry paused barely a foot away, tilting his head to the side as his lips dipped down in a frown. “Oh Lenny,” he not quite purred before taking a step back, and then another. “I won’t do anything to you.”