Training a Slave's Tight Anal Sphincter for his Mistress' Pleasure

In Miss Mae Ling's household, her slave possesses a tightly sealed anus that needs to be trained to fully please his Mistress. She makes her submissive slather his spit on her dick as she thrusts it in and out of his mouth. When her dick is overly slick from fucking his mouth, she withdraws it and unmercifully ravages his tight asshole. Her sissy boy yearns to pleasure his Mistress's cock and takes every inch, regardless of how harsh and rigid she gets. Miss Mae doesn't hold back as she ensures that her subordinate's orifices are loosened up and prepared for the next size increase.