Millie sucks my dick

Millie takes about half of the length of my dick in her mouth, then her lips close around my shaft and I feel her creating an airlock with her lips, creating that "sucking" sensation.

Millie holds still for a second, then starts to bob her head up and down. I look down at my step-mom kneeling in front of me with my dick in her mouth, feeling on top of the world I close my eyes to enjoy my blowjob.

Millie has now gotten a good rhythm going, and she uses her hand to jerk the part of my cock she does not have in her mouth. She is doing really well, but I can tell that she has no enthusiasm for this and wants to get it over with.

"Use your other hand to play with my balls." I tell her.

Millie does as I have told her without missing a beat in the rhythm of her head bobbing.

Millie is now bobbing her head up and down at a faster pace, and she is jerking my cock at a faster speed. Then, she quickly takes my cock out of her mouth, and without looking up at me says:

"Do not cum in my mouth."

Then, without waiting for me to reply, she goes back to sucking my cock.

I can feel that I am just a few seconds away from cuming, should I cum in Millie's mouth even though she told me not to?