A long time ago I remember reading a slash story about a slave undergoing an obedience test, and I have a feeling it could have been a bandom story, probably featuring PATD RPF. Or maybe not; I could be totally imagining the connection, yet I remember the story as having a sweetness which reminds me of the PATD stories I've read. Yet my memories of the story could be false and I can't remember any characters or pairings. I read the story a long time ago.
The story features a slave who needs to pass an obedience test, probably because he is on his last chance and will be put down or sent to hard labour if he doesn't conform. The story is slash, has a kind master with several slaves, somehow gets a new one who undergoes the exam, which is a regular exam for slaves every few years. The master reluctantly trains the slave and tries to gain his trust. The slave may have been violent but only from panicking. At the end the slave has to pick up and hold an item that hurts, but I think it does not damage him.
This is the story I hope to find, if it exists, but I'm keen to read anything with slave obedience exams. And if this story is not PATD after all, it should have been!