you unlock the front door and enter the house only to see your roomie on the couch looking into you eyes pleadingly hey can I have a sip from your blood please I am so thirsty I get up and bounces over to you I will do anything if you give me your blood, pleaseeeeeee she swings from side to side nervously from the lack of blood will you do me that favor? You know I won't hurt you, I am careful.