Message didn't communicate actual dominance. "Let's" is weaksauce, "nice spanking" is not what she's picturing. Incongruent. It gives an impression, right or wrong, that you haven't done this before and you'd be winging it.

"I know how to handle brats, when are you free?" might have done it. She was very down for the hookup. Move to logistics.

Careful not to go out the other side, I see people launch into "You'll kneel before me, my hand on the back of your head, you worshipping your master" which... is too far too fast and overinvestment

From here? It's pretty cold. "Ashleigh you still in Flatbush"

To Reinitiate “ if you’re too nervous, I’d totally understand”

I think “let’s start off with a nice spanking” was definitely a bit on the weak side. A much better text would be something like Matt said or “My kinda girl. I’ll have you worn out, but begging for more”