"Open your mouth"

I say and push my cock against Millie's lips. Millie does not open her mouth, so I hold my dick in my hand and rub it across her lips, then her cheeks and even her nose. Millie closes her eyes, she really seems to like this. I keep rubbing my cock against my step-mom's face, then I rub it against her lips. Millie's mouth opens slightly, and I can feel her lips against the tip of my cock now. Very gently I push my dick forwards, and as I do so, Millie opens her mouth fully, accepting my cock into it.

I push about half my cock into my step-mom's mouth, then I pause. Millie opens her eyes and looks up at me, nodding. I realise she wants me to push my cock in further, so slowly, while looking Millie in the eyes, I push my dick all the way in until I feel Millie's throat. I pause for a bit here. Millie has now closed her eyes, and I can tell that she is fighting her gag reflex. Then, when I sense that she is ready, I push the final inch of my dick in and down her throat.

This makes Millie gag, so I take my cock out, but soon Millie opens her mouth again, accepting my cock into it, and I push it down her throat until Millie gags on it.

"Again!" Millie says and opens her mouth and I push my cock down her throat yet another time, and this time I am successful, Millie does not gag, so I leave my cock in her throat, gently moving it in and out and after a few moves I cum down my step-mom's throat, causing Millie to choke and cough as cum being released into her throat comes as a complete surprise to her.

I look down at my step-mom, the area around her mouth covered in my cum, and cum is even dripping of her chin. Millie looks back up at me, saying:

"Is this what you wanted?"

"We both wanted it." I reply.

Millie stands up and walks into the ensuite bathroom, saying:

"Good night Matt."

"Good night Millie." I reply and go across the hall to my room.