(In order to understand the dinim of Ribis and if this particular case would be problematic I will give a localized example. However please don't close the question or say it's too "local" because the ...
Suppose that Reuven is strapped for cash. He goes to the local Gemach and gets a hefty $10,000 dollar loan for his daughter's wedding. 3 months later, Reuven manages to acquire the money and repays ...