I think a good video would be if a guy is friendzoned and then a brat princess convinves him to go into chastity if he wants to be around her. After some back and forth he finally agrees.
 
Then rather than her putting it on him herself or making him do it, she takes her to a chastity specialist. The chastity specialist explains you can go on a scale of 1-10 for tightness. 1 means its extremely loose and 10 means he could get really sick. The chastity specialist asks them what they want, and the brat pincess asks the guy how much he loves her and is willing to do for her. He says maybe a 3 and then she pushes him to agree to higher and higher. They end up at a 9 because she doesn't want to kill him, but wants it very tight. Maybe the chastity specialist is even impressed as most people it takes years to go to a 9.