A promise is a promise no matter how much you regret it. Bend over, bite your tongue and prepare for your ass to get fucked by a pegging beauty.
 
You need to be taught a lesson in how to take it in the ass, so do me a favor and prepare that butt of yours for invasion. I've never been this horny for a pegging session before, but there's something about your obvious submissiveness that drives me over the edge. I sure as hell hole you're keep to have this big plastic dildo deep in your ass.
 
It feels so good for me to be doing the plugging for once! Sure, being a female is great, but now I appreciate just how much fun guys have. By the look on your face, you also seem to enjoy the fact that you're experiencing the other side of the coin. Your butt is super tight and looks fantastic with this shaft inside of it. We can arrange more strapon sessions in future - I can see how much you love being pegged like a sissy.
 

 
Mistress explained that you were to come over today and to not eat breakfast. You weren't sure why, but whatever the reason, it can't be good for you.
 
Try and relax as much as possible. As my slave, it's important for you to realize that my wish is your command. If I say jump, you say 'how high'. Get it? Good, so what I'm going to do today is something that I know you're going to be a little worried about, but will be totally enjoyable in the long run. I'm going to peg you in the ass.
 
I just love the idea of you roleplaying as the receiver. You've never had anything in your asshole before, but that doesn't mean we have to keep it that way. Now, open up wide and get ready for my hot strapon to be inserted into your ass. See, I knew you'd love it! You're a great slave and you sure know how to take a big fat cock in your rear.
 

 
If you thought that you were experienced sexually, think again. This lovely lady is going to teach you all about pegging and submission.
 
You might like to think that in our sexual relationship, you're the one with the power, but the truth is I'm the person in charge. Now do me a favor and help me put this strapon on - your asshole is going to be treated to the most sensual of delights delivered by my huge plastic friend here. I've waited so long to teach you the ways of the sissy, now it's finally time!
 
It's really easy being a sissy bitch, isn't it? You get pegged pretty well and I'm so happy to see a smile on your face as I'm fucking that tight hole of yours. I've never had this much fun with a guy and his asshole before, but I now know for next time that when we have sex, you'll bottom and take all eight inches of this plastic dildo.
 

 
If you've ever wondered what it would be like to hit rock bottom in terms of masculinity, surely getting pegged by a black mistress with a white strapon is exactly that.
 
Come here white boy - I've got a nice juicy cock for you to take in the ass. While the color of it might be like yours, we both know only a big black cock could ever reach this level of length. To tell you the truth, I can't wait to turn you into my little sissy bitch. Your ass is going to get destroyed and I'm going to love every second of pegging you as deep as I can.
 
It's so great to see you accept your situation. The submissive sissy slut inside of your really shines through! It's obvious that you secretly love being turned into a woman with this huge dick being put deep inside your asshole. Fucking it over and over again just makes me so horny! Maybe next time I'll get a real black bull to come in and destroy that rear entrance of yours.
 

 
Training your ass into submission hasn't been easy for this mistress, but she's finally about to have her way with your ass - literally.
 
How about we stop beating around the bush and just admit that I'm in charge when it comes to the bedroom experience. You can wax lyrical about how tough you are, but the simple fact is I'm your mistress and you would do anything I told you to. In fact, we're going to prove that today. I've got a strapon and I'm really not afraid to use it.
 
Prepare your ass for the invasion of a lifetime. I'm not about to be beaten by some guy that can easily be turned into the sissy slut of my dreams. Your asshole is due for a fucking and this dominatrix right here is the one to do it. How great does it feel to have someone pummel your tight hole into submission like this? You must feel pretty feminine getting pegged in the butt!