"Bra Trouble and Beer Bellies: The Harrison Family's Hilarious Hijinks"

Prompt: Chapter 1: The day started on a rather peculiar note for the Harrison family. Brad, a 21-year-old son known among his friends as having the hottest mom in town, found himself waking up with an unfamiliar sensation - a bra, to be specific, a DD size. At the same time, Kelly, Brad's curvaceous sister who was once a volley-ball star in her high school and college, woke up as a 45-year-old man with a beer belly. From a fit body and a hefty chest, to a portly figure, her transformation was a comic tragedy. "What in the...??!!" were the first coherent words out of Brad's mouth as he discovered his predicament. His reaction, in a high-pitched voice comparing to his usual baritone, sent an alarm throughout the house. In another room, Kelly was experiencing a similar situation, but her discovery was slightly more dignified. As she studied her reflection, looking back at her was an older man with thinning hair and a voluptive beer belly. Kelly let out a high-pitched scream, which for once resembled the sound of her dad, Roger. The coincidental screams from two different rooms were enough to wake up their parents. Roger, awaking in Kelly's body, jumped to his feet. His initial reaction upon seeing his curvy figure in a mirror was of comical shock. His wife Susan, waking up in Brad's body, took one look at the muscular figure and exclaimed: "Well, this is new." Chapter 2: As much as they would have loved to stay home in their figure-altered states, they had a family gathering scheduled for later that night. It was the annual Harrison Family Extravaganza, a night full of relatives enquiring too much about too little. The thought of explaining their recent predicament was less appealing than a root canal. "Okay, listen," Susan sounded determined, "If we have to get through this nightmare with our sanity intact, we have to help each other out. We will spend the day practicing our body languages. Brad, stop touching your...err...my chest. And Kelly, work on that slouch." The scene that followed was one of chaotic comedy. Brad guided Kelly on how to scratch her...well his... beer belly convincingly, while Kelly taught Susan how to shrug like Brad, a trick that involved a lot of shoulder action and a specific, indifferent facial expression. For his part, Roger honed his duck pout and Instagram poses. Chapter 3: The family gathering that evening was hysterically chaotic. There were a lot of suspicious glances, but surprisingly, no one explicitly called out the Harrisons on their unusual behaviors. In fact, giggles and chuckles dotted the conversation, until Uncle George, slightly inebriated, clapped Roger on the shoulder. "Gained weight, haven't you, Bradley? Those midnight snacks finally catching up with ya?" This sent the entire family into a laughing fit, tea spilling, tears streaming, while the shell-shocked Harrisons tried to recover. With everyone too occupied in their mirth to even glance at the Harrisons, they shared a look and simultaneously let out a huge sigh of relief. And so, they survived The Harrison Family Extravaganza, promising themselves to take this ridiculous secret to their graves, or at least until they figure out how to swap back. The day had been long, exhausting and hilarious all at once, turning into a family story they'd never forget, not that they had a choice. The end.