The story is told from a teenage boy's perspective. He and his mother have to live with her sister's family. His mom is an uptight Christian and recently divorced (ashamed of that as well). Her husband cheated on her though and she could not abide that.
The Family they move in with uses Christian Discipline. The mother (his mom's sister) and eldest daughter serve the household naked, and obediently. They submit to spankings and do so because of their interpretation of religion. Their motivations are to be obedient as the bible says their role should be, and to atone for past sins - thinking it is better to suffer a lifetime on earth as a pentinant than it is to suffer an eternal torment in hell.
Their personalities - maybe the Mom of that family is naturally submissive and accepting of this role, but the eldest daughter is sassy/opinionated and frequently gives confession of her sinful thoughts and actions.
They also have two sons, and a youngest daughter. The youngest daughter rejects this role, and is reluctant to do what she is told by her father/brothers.
When the story begins, the Aunt arrives and is shocked that she is greeted by her sister in the nude. She quickly ascertains that this is done to keep her modest and not subject to vanities of the flesh. She is wearing no makeup and her hair is not braided. The aunt having little choice but to stay because she used up all her cash driving there/car has broken down must reluctantly accept staying there - and the story progresses through the son's eyes.
Here is a list of biblical verses that could be interspersed into the story.
1 Peter 2:18
Peter 2:18, NIV: "Slaves, in reverent fear of God submit yourselves to your masters, not only to those who are good and considerate, but also to those who are harsh."
1 Peter 2:1
Therefore, rid yourselves of all malice and all deceit, hypocrisy, envy, and slander of every kind.
Exodus 21:7-7
If a man sells his daughter as a servant, she is not to go free as male servants do. 8 If she does not please the master who has selected her for himself,[a] he must let her be redeemed. He has no right to sell her to foreigners, because he has broken faith with her. 9 If he selects her for his son, he must grant her the rights of a daughter. 10 If he marries another woman, he must not deprive the first one of her food, clothing and marital rights. 11 If he does not provide her with these three things, she is to go free, without any payment of money.
Titus 2:3-5 ESV / 11
Older women likewise are to be reverent in behavior, not slanderers or slaves to much wine. They are to teach what is good, and so train the young women to love their husbands and children, to be self-controlled, pure, working at home, kind, and submissive to their own husbands, that the word of God may not be reviled.
1 Corinthians 11:3 ESV / 10
But I want you to understand that the head of every man is Christ, the head of a wife is her husband, and the head of Christ is God.
1 Peter 3:1-6 ESV / 8
Likewise, wives, be subject to your own husbands, so that even if some do not obey the word, they may be won without a word by the conduct of their wives, when they see your respectful and pure conduct. Do not let your adorning be external—the braiding of hair and the putting on of gold jewelry, or the clothing you wear— but let your adorning be the hidden person of the heart with the imperishable beauty of a gentle and quiet spirit, which in God's sight is very precious. For this is how the holy women who hoped in God used to adorn themselves, by submitting to their own husbands, ...
1 Corinthians 14:34 ESV / 8
The women should keep silent in the churches. For they are not permitted to speak, but should be in submission, as the Law also says.
1 Peter 3:1 ESV / 7
Likewise, wives, be subject to your own husbands, so that even if some do not obey the word, they may be won without a word by the conduct of their wives,