With a little work

With the first thrust she gets about four inches in your arse. You feel her slowly withdraw it and then thrust it in again. This time getting another half an inch farther in.

You look around and see mirrors set up. You can see the dildo as it goes further and further in to your arse hole.

You watch her as she fucks your arse getting in a little deeper each time.

Watching her tits bounce as she is fucking your arse is turning you on. You reach one of your hands under yourself and start jerking your cock.

She quickly spots you and steps on your wrist. She then tells you "We will take care of that later."

You ache with the need to take care of yourself but you don't want to upset her.

Before you know it the rubber balls of the dildo are hitting your own balls.

She pulls the dildo out of your aching arse and tells you "That was a little easy I think we should try a bigger dildo."

You watch her walk over to a bag on the table. Once there she unclipped the twelve inch dildo and put it away. Then she reached in the bag and pulled a fourteen inch dildo.

The two extra inches did not worry you. But the fact it looked twice as thick as the last one did.

She takes the dildo and shows you she can deep throat. Just like a sword swollower she tilted head back and slipped all fourteen inches straight. Then she pulled it out and added some lube to it before strapping it on and walking back to you.