"You weren't paying attention to Mia, were you?" Draco said, laughing. It sounded so much like Potter that it hurt, which was why amusement was the way to go. "Someone has been going through time and realities, changing critical points in time that lead to the destruction of that reality. The bus drops us off where it senses these temporal distortions and we have to fix the problem or the reality ceases to exist. We've been successful all but once. It wasn't pretty."
He sighed. "This reality is not easy. We have to ensure that social mores don't change too quickly. The starting point was ensuring that the general store didn't close, but usually it's not one thing, but a sum of things."
Draco smiled. "Because having ice cream on a Sunday is very normal and we aren't changing the social norms. Telling people about your husband would, so when here, talk about your wife."