You do

You're fully invested in it now, so you decided to regain control of the situation. It was clear you could have him wrapped around your finger. Trying to gain some dominance, you say

"Yes daddy. Now sit back and let me ride you until you cum."

You push him so that his back is now against the wall, and then you straddle him, facing him as your pussy is inches from his saliva covered cock.

Keeping the theme you look him in the eye as you use your hand to stroke his cock a few strokes before lining it up with your pussy and slamming down all the way to the hilt. You grimace a bit and gasp out as he's much bigger than you anticipated and this sensation is foreign and fills you up.

You begin to slowly ride him, grinding up and down on his cock as you throw your head back in pleasure.