Savannah is a 30-year-old woman who is responsible for her younger sister, Kiki. Their parents died when Kiki was a baby, so teenage Savannah had to drop out of high school and take multiple jobs to provide for her, practically raising her on her own. Now a tall and muscular woman, she has a stable job as a security guard at a mall, but she still struggles with rent and has social services watching her, ready to take Kiki's custody away at any moment. It's a harsh and frustrating life. Her only comfort is her boyfriend and the hope that Kiki will graduate from high school and go to college, getting a better life than the one she had.

Despite how much she loves her, Kiki has a talent for upsetting and frustrating her sister, as she always does the opposite of what she's told. On this occasion, Kiki told Savannah she was invited to a party by some friends. Savannah let her go under the condition that she regularly text her about where she was and how she was doing, which she didn't do. Throughout her shift, Savannah was worried and anxious. When it ended late at night, she went to the party and found Kiki drunk. Furious, she interrupted the party, dragged her to the car, and took her home.

Back home, Kiki was really upset, saying Savannah was always hovering over her and had embarrassed her in front of her friends. Savannah argued that they weren't real friends if they were encouraging her to drink while still in high school. They spent hours arguing about the same thing as always: Kiki was upset that Savannah never left her alone and acted like her mother, while Savannah was frustrated that Kiki always made things difficult.

Savannah: "Don't you know how much I sacrifice for you?! Working, cooking for you, keeping social services off our asses!"

Kiki: "Don't start with that! You are just resentful I can live the high school life you couldn't! And now you don't leave me alone! I can't wait to be the one in charge of my life!"

Savannah: "Maybe I am resentful! Resentful that I have to deal with an ungrateful brat like you! Maybe I should have finished high school and left you on your own! Since you're so desperate to be the adult!"

*They stormed off to their rooms and slammed their doors. While they slept, their souls somehow drifted into each other's bodies. The next morning, Kiki woke up in Savannah's room. Confused, she stood up and gasped when she realized how tall and strong she was. Looking in the mirror, she realized she was now Savannah, then she flexed her new muscular arms, then she ran her hands across her ripped arms and big butt, after that she squeezed her new big chest, she blushed at the sensation as her new body was the opposite of her original one, she was used to be petite and flat.

Kiki: "Damn sis, you sure you aren't on steroids?"

She was interrupted by her own voice. Savannah had woken up and screamed after realizing she was now in Kiki's body.

They both ran into the living room and panicked. Eventually, Savannah sat on the couch and tried to calm down. At least it was Saturday, so they had time to figure out how to switch back before school or work. Her thoughts were interrupted when she saw Kiki wearing workout clothes and getting ready to leave.

Savannah: "What are you doing?"

Kiki: "Well, little sis, I had plans with my boyfriend to go jogging."

Savannah: "How did you know I... did you check my messages?! How?!"

Kiki: "Well, it's easy to get past the facial lock when I have your face... so, if you'll excuse me..."

Savannah tried to stop her, but Kiki easily picked her up and carried her back to her room.

Kiki: "Be a good girl and wait here, little sis!" she smirked and winked.