A marriage of convenience.

Scarlett has moved to Scotland with her little brother, since they lost their father. It was the only way to claim custody of her little brother, since she was considered of age.
She meets with Professor Dumbledore in order to attend Hogwarts, although he is unable to accept Tom since he is too young. Thankfully he persuades Molly to take Tom with her, so Scarlett will be able to attend.
What will happen when Marriage Law is implemented and all witches and wizards are forced to get married?
Scarlett needs to find a husband that would accept Tom and adopt him in order to continue having the custody.
Just when things are starting to get too stressful to handle, a certain strict sour but true to his word Professor appears to save the day.