@Unknown Source well yeah, the previous chapter, that man said that Wren (the vampire who took care of Tristan) forcefully took some blood out of Tristan's father, but you can clearly see that he's doing a kind of a trade with him, but Tristan's father threatens Wren's identity to be known to Vampire Hunters in exchange for s** and the blood Wren needs to relief his hunger as he doesn't want to hurt humans.