Two years after the war, Hermione and Draco have a one night stand that becomes more and they eventually get married, unfortunately married life is harder than they expect and after a year of marriage, they get divorced. Later, Hermione finds out that she is pregnant, she keeps the pregnancy a secret from Draco with the help of her friends, that is until Hermione ends up giving birth to twin girls that she names, Cassiopeia Lyra and Halley Narcissa, it's at this point that Hermione realises that she can't raise her daughters alone but isn't willing to see Draco, so she leaves Halley on his doorstep with a letter explaining everything and apologising. Seventeen years later, the twins end up going to the same wizarding summer camp in America and end up meeting for the first time, havoc ensues before the twins realise that they are in fact twins. With the help of Halley's best friend, Zack Zabini and Cassie's best friend, Jasmine Longbottom, the two switch places in order to meet the other's parent. While switched the girls find out about the other's darkest secrets along with the fact that their parents might still love each other, it turns out that this switch is going to change everyone's lives in ways that no one expected.

After becoming Head Girl and Head Boy and after Draco apologises for everything that he did in his past, he and Hermione form a friendship that eventually leads to a secret relationship. The two date for a year until Hermione unexpectedly breaks off the relationship, leaving Draco confused and heartbroken. Seventeen years later, Draco gets some questions answered when he opens his front door and finds a nearly seventeen year old girl claiming to be his daughter.