Quality Over Quantity

"Sir William, don't hesitate to call me again if you ever need more blood," Cathy said with a blush as she stood up from the bed. "I will always be available for you."

"Thank you, Cathy," William replied. "I will keep that in mind."

William had just finished drinking her blood, and this time, he drank until he was full. He wanted to know how powerful Cathy's blood regeneration was, and his discovery left him speechless. 

At first he drank her blood sparingly, but after sensing that Cathy's blood was regenerating at a rapid rate, he decided to take it to the next level and drank deeply.

Cathy didn't voice out any complaints, and only sighs of pleasure escaped her lips. After making sure that the pretty lady was still in good health, William continued to drink her blood until he was full.