Fucking Millie in the ass

Once the mushroom of my cock has pushed past her sphincter, Millie pauses and just lays there, her ass clasping my cock tight. She has clinched her eyes shut, and is breathing quickly through her clenched teeth.

I stroke her arm gently and whisper in her ear:

"How does it feel?"

"It hurts a bit, you got a really big head on your cock." Millie says between rapid breaths.

"Do you want me to take it out?" I ask her.

"No." Millie replies determined sounding, then continuing:

"I want you in my ass, Matt."

Hearing that really turns me on, and I slowly start pushing my cock deeper into Millie's tight ass.

As Millie's ass starts to accommodate more and more of my cock, her face is growing increasingly red and she is breathing more and more heavily. Then, finally, with one last push I get my cock all the way to the hilt into Millie's ass. For a while I just hold still, giving Millie the chance to adjust to having my cock in her ass.

I lean my face in close to Millie's face, stroke her cheek, and whisper:

"What's happening to you right now?"

Millie breathes twice before whispering back:

"I am being fucked in the ass."

I slide my cock out about two inches, then push it back in again, and Millie lets out a moan. I repeat again, this time a bit more forcefully. Millie moans again, but I feel her body starting to relax. She must be adjusting to having my cock in her ass.

Slowly I start grinding my hips, pushing my cock in and out of Millie's ass. She keeps moaning, but I can sense it is now more moans of pleasure rather than moans of pain.

I grab Millie's hips with my hands and pull her up into the doggy style position, my cock still in her ass. I look down at the sight of my step-mom in front of me, my cock buried in her ass, and I pause for a while, just savouring the view.

This must have taken longer than I thought, because Millie turns her head and looks back at me over her shoulder, saying:

"Fuck my ass hard, Matt."