Mercy Minute: The Buying of a Discount Elf (гет)

The story takes place in a modern world, where humanity has won the war against the vile demihuman menace, and enslaved their fallen enemies. Our protagonist, David, wants a slave of his own. The only problem? They're expensive. But David has just found out about a way to buy a slave for cheap. They might not be the best quality specimens, but for $500, it's a bargain he can't resist. He's a bit conflicted though, claiming his cheap slave requires participating in something rather heinous...
Note: Rated "Explicit" for seriously fucked up gore and cruelty, not sexual content. (Not sure if I should use "Mature" tag instead, but better safe than sorry.)