Slide my hands under her dress

Thinking about Millie not wearing any underwear, I lift up her dress slightly when I am sliding my hands along Millie's body. Millie does not react at all when I do this, and she keeps twerking against me, so I grow a bit bolder, and let my hand slide under her dress and up all the way along her naked thigh on my next move. I can feel that Millie notices, but she keeps twerking against me, so the next time I am moving my hands along her body, I slide both hands in under her dress, and just leave them on her hips, feeling the sides of her naked ass.

Millie slows down the gyration of her body, and now only her ass is moving, slowly grinding into my hard cock. She tilts her head back a bit, like she wants to look up at me, but her eyes are closed.