Louis owes a lot of money to Harry, who's happened to be a drug dealer. Unfortunately Louis can't get money to pay to Harry. That's why Harry have an idea. He'll make Louis to pay him with his step-brother Zayn.
So this is basically under age fanfic where Harry is 23 years old and Zayn is only 14. It will not be really long story, i think that it'll have like three chapters :)