Bill always noticed things. It was his job to see what others couldn't. One day he noticed something about the Potter family. About Lily in particular. All of the Potters had this smile (except for Ginny obviously), and this smile meant different things to each one of them. When James used it you knew he was up to something, when Albus used it he was laughing, when Harry smiled like that it meant he was with his family. Lily was the only one who rarely used it. Sure she smiled a lot-she was one of the most smiley people Bill had ever met- but he had only seen this smile a couple time.
The first time was when she was six and Teddy had come home for Christmas break. When he walked in the door she came running out of her room and into his arms and he spun her around and told her how much he missed her and she smiled.
The second time was when Teddy was 26 and Lily was 15. He had been injured and was staying at St. Mungos. She entered the waiting room with a worried look on her face and she was practically running. When she saw most of her family already at the hospital she stopped. "Where is he?" she asked in a small voice. Albus pointed to a door and she walked slowly to it. When she opened the door and went in everyone was silent. Even Victorie. Everyone waited a few minutes and then rushed to the door at one time. The family filed into the tiny room and saw Lily sitting by Teddy's bed holding his hands. She was talking and making him laugh and his hair was flashing from color to color. If you looked close enough you could see tears rolling down Lily's cheeks. But she was smiling that Potter smile.
The next time Bill had only seen in a memory. Victorie's memory. The third time was when Teddy had come to pick her up from the platform at the end of her 7th year. He was waiting for her by the train and when she walked up to him he bent down and whispered something in her ear. She looked up nodded and he kissed her. And she was smiling.
From then on she smiled a lot more of those smiles. At first Bill thought it only came out when Teddy was around but he soon realized that when the Potter's smiled like that it meant they were surrounded by something the loved. James loved mischief. Albus loved laughing. Harry loved his family. And Lily loved Teddy.