Nikki just squeezed her sister tighter.  She hated that Kat was bummed about her grades and wished the younger girl wasn't so hard on herself.  In Nikki's eyes, she was doing an excellent job with getting good grades, especially with that job she worked.  She pulled back and tapped the tip of Kat's nose with her finger.  "I know, but it is still nice to hear.  I love you too, baby doll." She teased her with yet another nickname.  Seeing as how Nikki was seven years older than her little sister, she'd thought Kat was the prettiest little thing there was when Kat was first born and she quickly abandoned playing with her baby dolls for a real live one, the nickname, however, still popped up occasionally.