"Yes"

I say, and partially release Millie, but I am still standing behind her holding her down on the bed, just not pushing her down as hard as before.

Millie gets one of her arms out, and quickly reaches behind her, grabbing my hard cock and starts to tug on it. I relax my grip on Millie a bit more as she uses her hand to pleasure me. Millie shifts her body to the side a bit, giving her better reach, and she starts jerking my cock at a very quick pace.

I look down at my step-mom, and she has a slightly panicked look on her face, and I realise that she is trying to make me cum as quickly as possibly, in case I change my mind and try to fuck her instead.

I let go of Millie completely, and she sits up on the bed in front of me, and starts jerking me with both her hands. I reach down with one hand and gently stroke one of her big tits. Millie flinches at the touch, but allows me to continue. I reach down with my second hand and cup Millie's other breast, then I start to squeeze her boobs, gently at first, but then more greedily as my courage grows.

I look down at Millie and see that she is looking up at me, a look that I can best describe as defiant in her eyes. We lock eyes for a few seconds, but when Millie increases her pace of jerking I close my eyes due to the pleasure I am feeling and within a few seconds I feel myself cuming.

I keep my eyes closed as the waves of pleasure from my orgasm hits me, and then I look down at Millie, my cum is all over her bathrobe.

Millie lets go of my dick, looks at my cum all over her bathrobe, then looks up at me saying:

"Is that what you wanted?"

Not knowing what to say I don't reply.

Millie stands up and walks towards her ensuite bathroom, saying:

"Good night Matt."

"Good night Millie."

I mumble in response and close Millie's door as I leave.