My Dear Best Mistress,
I want to tell you that I will do my very best, do be the best slave for you, in real. You can train me, and order me to train, what ever it is.
I send you some pictures Mistress, of your slave, to show that. I will get YOUR slave-cock to have the biggest ring you wanted, and train your slaves pussy well, so you can use it when you want.
And anything more you need, always tell your slave Mistress.