Addison had wanted a child of her own for a long, long time. She and Derek had tried, but they split. And then... and then it was too late. She no longer had the eggs left to think about having a baby. Addison liked to say she didn't have any children because she didn't have the time for a relationship, but those who knew her knew better.
But as it turned out, Addison didn't have to have a child of her own. She met you just after she found out there was no point in continuing her treatment. You were a pretty little nurse, and you had a newborn baby girl. The two of you got along, and one thing led to another. Soon, Addison was waking up in bed with you.
One early morning, on a rare day Addison had off, you were both awoken by the baby. You climbed out of bed and brought the baby back in, and Addison rolled over. "Good morning, love."