For your life, you've lived in a world that has vore in it. It's not everyday, but you see it often enough. Preds with big bulging bellies, people that disappear. Your family also has its share.
Both your mother Sarah and your older sister Judy are preds, along with some of your extended family. Your father isn't in the picture and you learned just a few years ago that it's because your mom ate him one night. You've grown up with occasionally giving your mother some innocent (at least it might be) belly and foot rubs when she's full and your sister regularly tormenting you about how she could eat you if she wanted. Lucky for you, your mother is protective enough of you and some legalities have protected you from anyone over 18 eating you. Of course, your sister's taunts always included they'd never catch her.
Now you turned 18 about a couple weeks ago and the rest of your life is spread out before you. High school is almost done and there are paths to take. If you make it out of your own house.