"Cow girl"

I reply without hesitating, smiling a big smile at my step-mom, then sliding my cock out of Millie's ass and laying down on my back next to her.

Millie does not get on top of me, instead she moves her head down to my cock and takes my dick in her mouth and starts sucking on it.

Wow, she is doing an ass to mouth! I think to myself as I close my eyes and enjoy the feeling of Millie's lips on my cock. Millie sucks on my cock for another few seconds, then her mouth comes of it and she climbs on top of me. Millie reaches behind herself with her hand, grabbing my cock and pointing it towards her sphincter. Millie slowly grinds her hips back and forth, easing the first inch of my cock into her ass. Once she has gotten the head of my cock into her ass she pauses, looking down at me with a naughty smile, then with one sudden movement she slides down all the way to the hilt of my cock.

Then she pauses, adjusting to being anally impaled on my cock, but after a few seconds she slowly starts moving her hips up and down, riding my cock.

Millie has her eyes closed as she rides my cock, and I let my hands wander up to her big tits, starting to play with them.

"Mmmmhhmmm... That's it Matt, enjoy my big tits while your cock is in my ass." Millie whispers and starts riding my cock with more rapid movements of her hips. I can feel that my cock is now sliding in and out of her ass with more ease as her sphincter has now really opened up. Millie then adjusts how she is sitting, leaning back so I can see my dick going in and out of her ass.

"You like that, Matt? You like seeing your cock in my butt hole?"

I look up at Millie and see that she has opened her eyes and is looking straight at me.

"This is so amazing Millie." I reply.

In one rapid movement, Millie slides of my cock, and moves down and starts sucking it. Wow, another ass to mouth! I think to myself. Millie sucks on it for a few seconds, then climbs back on top of me, getting my cock into her ass without difficulty.

Millie now starts riding my cock with a furious pace, and I feel that I am really close to cuming now. Millie must feel this too, as between moans she says:

"Make me your slut Matt. Make me your slut by cuming on my face."