Well, its definitely not a monster girl...

You eventually realize that it's your own feet causing the smell. "Oh dear, I should probably wash them. I don't want to smell as bad as some of the monsters I'm fighting..." You mutter, as you ride your horse in search of a stream or pond where you can wash yourself.

After an hour or so of riding, you find a small river and the lake it connects to. You see that the water is shallow, so you strip down and get in, letting your horse drink some water nearby.