Just cum in her mouth

I think to myself. This is an experienced woman, and she surely has sucked plenty of cocks in her life time, so is aware that they spew cum.

I barely have time to think that and then with a groan I release my cum into Millie's mouth. This takes Millie by complete surprise, and she gags on my cum, and starts to cough. My cock pops out of her mouth, and she tries to stroke it with her hand as I finish cuming, but unsuccessfully as she is coughing so much.

Once she has finished coughing, she looks up at me with a slightly accusatory look. Her mascara is running a bit, and she has a bit of cum running down the corner of her mouth.

Millie sits back up straight on the bench, looks out over the city's lights for a while without saying anything, I can tell she is thinking, then she says:

"I am cold, can you take me home Matt?"

We get up from the bench and walk back to the car in silence, and as we are driving back to the city, Millie still does not say anything. I want to break the silence, but what should I say.