Let Millie know I am cuming

Millie is patiently sucking on my cock, and I can feel myself getting closer to cuming. I move my hands down and caress Millie's tits through her shirt. Millie does not react to me fondling her tits, she just keeps sucking on my cock.

"This feels amazing." I say out loud.

"Mmhhmm." Millie responds, her mouth full of my cock.

Millie keeps sucking for a little while longer, then sits up and pulls her top over her head, revealing her big tits contained in a white lace bra. I can see my step-mom's nipples through her bra, and I get immensely turned on.

Millie looks at me and says:

"Matt, sweetie, you will need to cum soon, my neck is getting tired."

She looks at me, waiting for a reply.

"I am really close." I say, putting my hand on her shoulder, gently pulling her down towards my dick. Millie resists, and looks at me, saying:

"You promise not to cum in my mouth?"

"I promise." I reply.

Millie gives me a brief, not exactly trusting look, then she moves her head down and starts sucking my dick again. She starts bobbing her head up and down quite quickly, her saliva lubricating my cock, and I feel myself at the edge of cuming so I shout:

"I am cuming Millie!"

Millie quickly takes her mouth of my dick, but keeps jerking it with her hand, and simultaneously moves her body up so my cock is between her big tits.

I start to cum, filling the valley between my step-mom's breasts with cum. Millie looks down at the result of her work, and I see her start to smile at the sight of my cum spewing on her breasts.