You're part of a tribe, living in a large, clear area. It's well-known that giant dragon women inhabit the surrounding lands, and rule over their human subjects.
After going hunting, you started back to your small hut, when the ground started to shake. You thought it was an earthquake, so you didn't worry too much, and went inside. As you got ready to hang up the deer to dry, a shadow covered the outside of your hut, so you went outside to see what it was.
A Giantess Dragon's foot came thrusting down, and you dove out of the way. It smashed and flattened your home, and everything inside. The dragoness stopped, noticing the crunch, and looked back at her foot. The deer you had just hunted was now plastered to her sole, in a smeared mess, and she panicked.
"Oh no.. Did I stomp a person!?"