Martha was in her room really stressed; the 24-year-old chubby woman almost finished her college degree in biological engineering. She had to make a final project; she managed to create a way of making different cells behave like others, swapping their functions between them. It was barely functional, and she needed more tests. Everything would be fine, but her younger sister Madison moved to her apartment recently as she is starting college too.

Madison is the total opposite of Martha; the 18-year-old girl is tall, attractive, with curves in the right places, a total popular (and dumb) extrovert, and captain of the college cheerleaders. Since she moved in with Martha, she has annoyed her constantly, interrupting her study and test sessions with talks about college gossip or useless facts about the celebrity crush she is obsessed with that day. Today she was constantly interrupting Martha. After the 54th time Madison entered her room, Martha slammed the desk, stressed, and asked her to leave her alone. The slam made her project make a smoke screen that covered both. Everything turned black for them until some minutes later they regained consciousness. With horror and shock, Martha realized she was inside Madison's hot and tall body, and Madison was in her obese one. Martha couldn't believe it; her project made them swap bodies. She was going through mental ramblings on how to fix this when she noticed Madison making her new big chest and fat belly bounce while she giggled. Then Martha realized how serious this was.

Martha spent all weekend trying to make them swap back but failed every attempt. Now it's Monday again, and they are supposed to go to college. Martha dresses her new body with a sweater, jeans, and her glasses (which she doesn't need anymore in Madison's body but still uses due to force of habit). went out of her room only to find Madison wearing a cheerleader uniform in her new obese body; this really upset Martha.

Martha: "MADISON WHAT ARE YOU WEARING WITH MY BODY?!"

Madison: "You like it? You never listened to me when I told you your body was really attractive in her own way, a teddy bear plushie way." She giggled "Now I am so huggable! Oh, how exciting it is being you!" She says, making a small jump and gets tired "...doing the cheerleader routine in your body is hard," she laughs.

Martha sighs and tries to calm down. She wants to swap back as soon as possible; not only does she need to finish her project, but she also fears this is permanent. If she is stuck in Madison's bimbo body, there is the real risk of not being taken seriously anymore as a scientist, but most important, she is actually worried for Madison. Her attractive body was all she had going for her; now, inside her obese body, she is just a dumb bimbo who doesn't fit the usual beauty standard and has no skill or talent in particular. Madison giggles again and poses.

Madison: "Besides, now that I have your body, I am a total BBW!"

Martha: "I TOLD YOU I HATE THAT ACRONYM!" She said, upset.