Door 4 - Sissy, this is your first job!

Present yourself my little mare! Your mistress wants to see if you're well prepared for your big day! Let me see if you've put your back into it, little cock girl. Let's see if we really have the first real suitor for you today. Of course, as your pimp, I have to put you in a good position. Of course you're excited and horny! But I think you're ready to be ridden!