Crouch infront of the mirror and with the permission of your mistress. Masturbate until you cum. Catch all your cum with your bare hands and apply it to the pegging dick that your mistress is wearing. Now use your own cum as lubricant for your mistress to peg you from behind.
Look at your humiliated self infront of the mirror while your mistress peg you from behind.
Remember to thanks your mistress for her effort.