Cocksucking as a full time job is hard work, especially considering this might turn on your mistresses which could decide to pound your ass. It is about coordination, submission, endurance and great trainers. Mistress Patricia and Mistress Amrita plan on chaining their most talented cock sucker to a glory hole for a whole night, but they wouldn't want anything to go wrong, or the slave to collapse before the night ends. It is best to do a few session just to keep his skills in check.