"I go by Potter now. Not Evans." She knew that was a big thing to say to him given where logic should hopefully take him but it was better he knew. It was easier he knew. Besides, at the age he was at the moment, she knew he'd rather like knowing he ends up marrying her. After all, he had already made it obvious that he liked her by this age and she was the one pushing him away. She laughed fondly and shook her head. "You do start calling me Lily one day."
After all, wouldn't it be a little strange to refer to your wife by your surname?