Mistress Nina wanted her boyfriend to suffer a little and so she got him to wear a chastity device. After he had worn it, the mistress felt that the best way to deal with him and to have fun at his expense was to tease him to get him turned on. When he got a hard-on, the mistress laughed at how it hurt him and how he struggled to contain it.
Mistress Nina wanted this guy to wear a chastity device. So she teased him for starters to get him to think that it was a device for fun. He took the bait and when he tried it, he was shocked that he had voluntarily caged his own cock. He was now at her mercy as she hid the chastity key and he could not do much with his dick unless she opened the cock cage.