I get ready for the evening

I go into my room and then step into the shower to start to get ready for my non-date date with Millie. I'm probably in there for about 10 minutes or so, then I grab a towel and dry myself off, wrap it around myself, and start looking through my clothes to decide what to wear tonight.

As I am looking through my clothes, I hear a knock on the door, and Millie saying: "Matt?"

"Come in." I say, and Millie opens the door. She is in the lilac flowery summer dress I helped her zip up earlier, and she has also put on her make-up now. She is looking stunning.

Millie stops in the doorway when she sees that I am just wearing a towel. She very quickly looks my body up and down, and I wonder to myself if she likes what she is seeing, but she composes herself in less than a second, and maintaining a straight face she asks:

"Matt, can you see anything on the back of my dress?"

Millie turns around, and I look at her shapely ass which is outlined very well by the thin material of her dress, but all I can see is the thin outline of her thong under it. I take the opportunity to check out her ass now that I have been given a reason to do so, and then say:

"There is nothing on the back of your dress Millie."

Millie looks over her shoulder at me and asks:

"Can you see the outline of my underwear?"

"Yes, a little." I reply.

Millie sighs lightly, turns around and says:

"Okay, I will have to go without panties then. Thanks Matt."

Millie then just stares at me for a while, like she is surprised by something, and then she turns around and walks out of the room.

I look down, and realise that my cock is hard and pushing the towel up like a tent, and that Millie must have seen this.

Hoping this is not so, I walk over and stand in front of the full figure mirror doors to the closet, but the more I look, and the more I think about Millie's reaction, it is obvious that she saw it, and I see myself blushing in the mirror.