Chapter 1 - the rules

Chapter One
Sally and rob awoke to find themselves in darkness unable to move, bound by their legs and wrists.
Rob "Where am I"?
Sally "Who's their"?
Before their conversation could begin the lights came on allowing both sally and rob to take a look at their surroundings. As they peered around the room they could see they were in a bunker like building with a kitchen to the left with a glass wall. All of a sudden the speaker came on and a voice said,
"Hello rob and sally, you both must be wondering where you are. You are my prisoners here until you complete your tasks then you are free to go" Rob began to wriggle free.
"Escape is useless" said the voice. "Your task is simple". "You both must eat until you reach your target weight and then you are free".
Sally "Why are you doing this".
Voice "There will be limitless food available and you must consume a given amount each day". "You will live, eat and sleep here". "New clothes will be provided only when you're other don't fit anymore.
The speaker turned off and the constraints holding sally and rob down came loose.
Sally was 21 years of age, blonde 5ft 9 weighing around 8 stone 4bls. She had nice curvy hips, flat stomach and toned bum. Rob was 21 with an athletic build complete with six pack weighing 14 stone. He had always been very proud of his body but secretly enjoyed when he accidentally gained some weight in college.
Sally and rob looked at each other in terror to notice they were both dressed in the same black pants and white buttoned shirt.
Sally "We have to get out of here".
Rob "I don't think we can it looks pretty sealed up to me".
Sally "But I don't want to get fat I love my body".
Rob " It may be are only way out of here". "Come one let's take a look around this place first".
Behind them was a luxurious lounge area complete with sofas, a TV, magazines and a games console. To the back of the bunker was a single bedroom with a large king size bed.
Sally "Only one bed?"
Rob "Don't worry i will sleep on the sofa".
As they walked into the kitchen it became obviously they had a lot of eating to do.