C21 Blood transfusion

The room door opened.

David stood up and hurriedly asked the doctor. "How's my sister?"

"She lost so much blood that she needed more blood, but at the moment we are out of type O blood at the hospital." The doctor said.

Blood type O. Ella muttered and then spoke. "Take my blood, I have the same blood type as her."

“That will exhaust you.” There was fear in David's eyes