Feeding Vampires... And if you want to skip most of the text and know the rules on it then just read below:

The Crimson Club Rules: Human will wear a wrist band to monitor their heart rate/ If heart rate go to low then security steps in or if scared they will rip wrist band off or press vampire's collar/ No drinking too much blood that it'll kill the person/ No aggressive fighting unless for a good cause/ If human decides to do intimate things while being fed on it's fine/ If human is turned into vampire if asked or is close to death/ After feeding session you get a free meal and use a bloodpack if needed