The entire thing turns me on, same as what's already been said.

- The sound of the paddle/whip/hand/crop slicing through the air
- The audible impact against the skin
- The movement of the ass from the impact
- The moans she makes
- The screams she makes
- The Squirming she does as the pain flows into the body
- The cuddling she does after I have stopped
- The crying she does when I don't
- The giggling she does as she passes through her pain pleasure threshold
- The moaning she does when the impact hits her pussy
- The feeling of the warm skin against my hands when I rub the hurt out
- The feeling of the warm skin, as I fuck her from behind
- The taste of her tears on her cheeks
- The way her calves look when her heels come off the ground
- The way her boobs shake when she jumps from each hit
- The way her hair flies through the air when her head comes back in a pleasurable moan from the impact
- etc etc