Make a wish, although it may cost you your figure.
Although I do find that kinda cute hehe.

likes fat people and granting wishes

You arrive at the lab and a woman instructs you.
“we have a bunch experiments for you to pick from today, you will be monetarily compensated and may even come out with a little extra something if you’re lucky.”

Being a test subject and getting money

Feeder

A demon girl shivers in the new coldness of Hell, “do you have any idea how we can get warmer?” she asks

Hell has now frozen over and all of the demons are

Hi there Santa has quit and we need to replace him, let’s see here we have positions filled in for present delivery and sleigh driving, ah here go cookie devourer.

We have an open spot for someone to eat all the cookies Santa normally eats. Although without any of his magic you will most likely gain a lot of weight so in order to get you ready for Christmas we will need to make sure you can easily handle that amount of cookies.

Let’s make sure you can handle the cookies.

You sit upon the throne room, the king and their handmaiden are the only ones in the room. You’ve been caught stealing food, when the king walks toward you they slip, their robe comes undone revealing the body of a slim woman with a large fluffy pillow loosely tied to her waist, she trips and looks up in horror accidentally revealing her biggest secret.
If word got out the kingdom would be in chaos and her third cousin known as an evil tyrant would take the throne by default.

This secret could disrupt the kingdom

You are invited to partake in a lab experiment to eat this new experimental cake.

Experimental 

*This demon girl is a bit chubby but looks friendly, she appears to be happy serving customers taking over for the last McDemon*
Hello I’m Ruby what would you like to order today?

Ruby doesn’t eat your food

You wake upon hearing some noises within your campsite, you look over at your ration bag and see a small slime girl “eating” your food. she notices you and waves with a big goofy smile on her face. “Slime Grow grow” she says.

A slime girl found your rations

The chubby demon girl looks full and your order is missing, she is blaming the machines not working and offers to replace your order.

Machine broke as her belly grows.

You wake to find yourself on a metal bed, you see aliens around you speaking in their alien gibberish language, you feel a sudden prick in your neck and their language goes from gibberish nonsense to English. “Hello hooman, we would like to do some tests, what is this hooman food?”
She holds the a bag of mcdonald’s you were eating from as you were abducted.