The other house elf
She was standing near Flourish & Blotts, with a pile of boxes and bags in her arms that was almost making her fall over. She seemed to be waiting for someone, probably her master or mistress. Dobby drew nearer, still following the Malfoys. As he watched, a witch came hurriedly out of the shop and sent the little house elf flying. Without thinking, Dobby ran to help her.
"Let Dobby help you up," he said, "that witch made you drop all your things. Are you okay?"
"Winky is fine," the tiny house elf replied.
Dobby looked at her. She didn't seem too badly hurt, just shaken.
"Winky is used to being knocked over like that," She continued. "Winky is so small that tall witches and wizards do not see Winky."
Dobby helped her stand up. She was right about being tiny. Dobby himself was small for a house elf but Winky was only as tall as his shoulder. She had big brown eyes that seemed unusually innocent for a house elf. Her head was covered with a mop of deep brown hair, cut awkwardly so that part of it fell as an uneven fringe over her forehead. Dobby felt a strange urge to protect her that grew stronger the more he looked at her.
The two house elves began to pick up the various boxes and bags that lay scattered around them. They were just finished when an unfamiliar voice spoke.
"Winky, what are you doing? And why is there another house elf here? And WHY are all my parcels on the ground?"
This must be Winky's mistress, Dobby thought.
Winky answered her Mistress, "Winky fell over Miss, She tripped. Dobby came to help Winky Miss. He was being kind."
"Very well. Dobby I assume you have somewhere to be. Come along Winky, we have more shops to visit."
Winky thanked Dobby for helping her, picked up the pile of shopping and chased her mistress down the road. Dobby looked on in amazement. Winky's mistress hadn't shouted at her, or ordered her to punish herself. She had almost been civil with the two house elves.
He continued to watch Winky for a moment then turned around to follow his own masters into the bookstore…