It's time for your anal training. 
Mistress has you ready for Her, bent over and ready to take the next size up in your anal training programme. 
This cock is nice and thick and about 10 inches long.
Your ass has been primed already with smaller sizes and now it's time to level up to the next stage. 
Wearing casual attire of denim jeans Mistress shows you the cock you'll be taking for Her. She shoves it in your face so you get a good look at what you need to take...
She proceeds to peg you in the perfect way that only Lady Sara Borgia can. She is the Queen of pegging, the ass whisperer is the nic name She has been given.  She fucks like no other can. She excels beyond all others and you are so lucky she is inside you right now, spreading you, reaching deep inside and taking over your body, mind and soul.
Pushing you to your limits and training your holes.