Picking Millie up

I pick Millie up, and she looks amazing in a thin summer dress, it is flowery with a mixture of blue, lilac, and white, it goes about halfway down her thighs, so is quite short, and it has tiny shoulder straps holding the dress up. There is a bit of cleavage showing and it is definitely no hiding that she has big tits, but they are covered quite conservatively.

"You look stunning." I say when I see her, and Millie gives me a big smile, then spins around and says:

"What do you think of the back?"

I look at her shapely ass in the dress, and it is looking amazing.

"Looking perfect." I say after a few seconds of looking.

Millie turns back to face me, then says:

"Great, I did not want a line, so am not wearing any panties so I need to be a bit careful in this short dress."

My jaw almost drops to the floor on hearing that, and my cock grows hard in my pants, but Millie is not waiting for my reply, instead she turns away from me saying:

"Let's go."

I watch her ass swinging back and forth as she walks, thinking about her not wearing any panties under, but then I manage to snap out of it and I follow her.