My fursona was left at an orphanage a couple of days after his birth, and kidnapped by a trafficking organization when he was a kid. They weren't cruel to him or anything, in fact they were very nice. But they used him and other kids to smuggle contraband in town. Their reasoning? Who in their right mind would assume that a child is carrying thousands of dollars worth of stolen goods?
Rimna learned that what he was doing is wrong at an early age, but he didn't care, these people had become his family. That all changed one night when his curiosity got the better of him. There was a meeting of the leaders of the organization and he decided to eavesdrop. He was caught and they tortured him for a while, giving him a big scar across his face. The bad guys intended to kill him, but fortunately for the monkey, a team of black ops soldiers raided the place and killed almost everyone, saving the primate from certain death.
Said team of black ops soldiers discovered that the monkey had virtually no past, and he technically "didn't exist", as there were no records of him anywhere at all. He was a perfect candidate for their team, so after he recovered they gave him an option - join them and help them take down the rest of the organization and in return he'd get a new identity and a clean start, or spend the rest of his life rotting in a jail cell. The choice was pretty obvious.