For centuries, the Pineberry Estate had been relying on the blood supply bought from the blood farms. It was treated with a certain method to make the vampires not be attracted to normal human blood. Everyone's bodies were used to consuming such a modified version that feeding Otto with fresh blood now might bring about trouble to him in the future.
Even if Keagan didn't know about that, the way Wren said so told her that the blood coming straight from her arm wouldn't do. It would even cause side effects to Otto, despite being a lifesaver at the moment. However, what was Keagan supposed to do?
Keagan's eyes quivered, but she shook her head. "Let's just deal with it after it's done. I don't want to look back to this day and regret not saving Mr. Otto. Please help me help him, Wren."