You don't want to be a slave? Maybe this will change your mind...
<Every time you see panties during this tease you must edge.>
Sis has many talents. One is hypnosis. Before she released you from her little trap, she forced you to agree to be hypnotized. You just felt one of the effects, as soon as you see panties you come to edge of orgasm. It's going to ensure I have total control of that little cock of yours. Repeat the below 50 times as you give me 50 cool down strokes.
"The sight of your panties brings me to the edge, Mistress."