Repentance
Our story starts a day after the Battle of Hogwarts. Ex Voldemort supporters, Alecto and Amycus are being held in the Ministry of Magic until their trial. The new Minister Kingsley is talking to them.
Kingsley asked, "Why did you two help our side during the battle?"
Alecto said, "We wanted to pay repentance for all of the harm that we caused, Shacklebolt."
Kingsley smirked. "Since when did you care about anyone except yourselves?"
Amycus frowned. "We have changed. I'm sorry for everything we have done."
Alecto added, "We're sorry."
Kingsley muttered, "You seem sincere, but you must face punishment for all of your wrongdoings."
Amycus stated, "We understand."
Alecto agreed, "If it means that we can be good for the rest of our lives, then we will gladly accept our punishment."
Kingsley smiled. "I will make sure that your sentences in Azkaban are shortened for your honesty, Carrows. For now, enjoy your time in these cells."