How much blood is needed to drain a body

Julie stared at Roman, who continued to eat his meal until nothing was left on his plate. As she had spent her time staring at him, she had barely eaten anything from her plate. It seemed like he enjoyed his meal until the very last bite. 

Roman's two fingers swiped on the plate. While doing that, his eyes met hers, and for a moment, it felt as if everything around them stopped, except for the slow movement of his hand. The scene in front of her was erotic as he brought his hand to his mouth, and his tongue licked the liquid off his digits. 

"Enjoying watching me eat?" questioned Roman, his eyes staring into her brown eyes that looked slightly dilated. 

Julie's eyes lowered. She picked up the burger with both her hands and took a bite from it. But as the burger was too big to fit entirely in her mouth, some of the sauce came to stick in the corner of her mouth.