After Sun-Young misses a proposal deadline and gets Ho-Jun reprimanded by his superior, he takes punishment into his own hands. During overtime, he spanks her and orders her to wear a vibrator for a full day.
Naeun becomes Siwoo's little bitch. Her master orders her around anywhere, anytime whether it be the in the classroom, in the streets, in the restroom. He explores his slave's exhibitionist kinks and fucks in the restroom at Christmas eve.
Lee Han tells Han Su-Jin that she can have the evidence of her stealing packages if she does one last job of walking in public with a remote controlled vibrator toy in her. Han Su-Jin starts to get wet and imagines her breaking and squirting in public in front of others (Chp. 14)
Lee Han shows up and turns up the vibrator before Han Su-Jin passes out from trying to hold it together (Chp. 15)