Act cool like nothing happened

I decide that more likely than not Millie did see what I was doing. The glass of the shower cabin was foggy, and even if she thinks I was jerking-off she cannot be sure, so if I play it cool then she will be less suspicious, while if I start acting awkward then she will know I was up to something.

Thinking that this approach makes total sense, I walk out to the living room, and am just about to walk through the patio door when I hear Millie talking on her cell phone. Being a bit curious, I stop to listen, but all I can hear is Millie's part of the conversation, so these are the snippets I pick up:

"No, he is not in Vegas, he is in NY."

"Patti Fernald, that's my older sister!"

"Are you sure?"

"Thanks for letting me know. I will get them for this."

Then the call finishes. I stand absolutely still for a while, then sneak back down the hallway, and when I walk back out I make sure to make a lot of noise so that Millie hears me coming.

I walk out onto the patio, and while Millie is smiling, there is something calculating in her eyes when she looks at me.