Hello slave, I'm Mistress Morgan and I'm going to tie you up.
Begin by stretching for me. I don't want you to break any bones or pull any muscles while we're testing you.
Once you've done that, why don't you tie your balls to your ankles.
However, this time it's going to be a little bit different. Don't tie your ankles together and don't kneel; I want you to sit on your butt and cross your legs as much as you can and then tie each ankle individually to your balls.
Once you've done that, measure the length of the rope between your balls and your ankles and add them together. Write that down.