The slave tried very hard, his arse is very bruised from so much cane.

Now, Mistress Wildfire thinks he has earned a reward.

Mistress Wildfire needs some rest, so, the best place to rest is on his face! This is the reward.

The blonde sadist sits her beautiful fishnet ass over the face of the slave, so he cannot breathe.

While this may be his reward it is, still, ultimately her pleasure.