Blonde with big tits

"How about the blonde with big tits?" I say. Millie looks at the screen, this probably describes half the women on the screen. I say:

"The one in the purple bra."

Millie nods in approval, selects the scene, the DVD player makes a swishing sound and the scene starts. I recognise the MILF on the screen, it is Karen Fisher.

The scene starts with Karen looking at the camera, cupping her tits in her hands, slowly moving back and forth, then she says: "It is all about ass."

I feel my dick getting hard, both from seeing Karen Fisher on the screen and from sitting next to Millie who is wearing nothing but a bath towel. I feel like saying something, but what?