Made a mistresses' ass slave

Many dominant girls like to make their slaves their ass slaves.
An ass slave has to kiss the butt, worship it and smell it as long as the mistress wants!
Of course only the lady decides whether the slave has to
smell a tasty jeans ass or gets his nose right between her cheeks.
Really nasty girls may even fart right into the slaves nose
with his mouth closed with duct tape the girls are having even more fun!
For example the mistress plays on her PC or surfs on the internet for hours the slave has to smell her constantly!