Yui Misaki, the dominatrix, appears as the new caretaker in the Spittoon Slave series. Known for her elegant appearance and refined speech, she surprisingly takes pleasure in turning men into human spittoons. Beneath her gentle demeanor lies a clingy, unhinged sadist. This goes beyond simple spit-swapping—she forces the male slave to drink urine mixed with saliva and phlegm, and feeds him risotto turned into a slimy mess by her spit. If he fails to smile while drinking or eating, he'll be brutally slapped. Classic erotic acts like armpit licking and face sitting are included, with excessive saliva worship that melts the M man's mind into mush.