mia, a teen girl with sun-kissed hair and a bright bellyshirt, strolls barefoot along the shoreline, her toes sinking into the warm, powdery sand. She glances at the ice chest beside her, packed with drinks and snacks for a perfect afternoon. Her friends play volleyball nearby, the ball arcing into the blue as she picks up a mysterious, shimmering bottle labeled "Bellyquid."

mia turns the bottle in her hand, watching the liquid inside swirl with iridescent colors. "I've never heard of this before... Wonder what it tastes like," she muses, glancing toward her friends for encouragement. The label boasts exotic fruits and a refreshing fizz—just what she needs after a swim.

With a twist, mia opens the bottle, and a soft hiss escapes. She takes a tentative sip, the cool drink bubbling against her tongue with a surprising sweetness. "Whoa, that's actually really good!" she exclaims, savoring the unusual but delightful flavor.

As mia finishes her drink, she notices a curious sensation in her belly—a gentle, fizzy warmth that grows with each passing moment. She looks down in surprise as her stomach softly expands, becoming a little bloated and round beneath her bellyshirt. "Um... did anyone else try this? My belly feels... weird!" she calls out, half amused and half bewildered.

Her friends burst into laughter and concern, one poking her side playfully. "Looks like Bellyquid lives up to its name!" teases a friend, while another inspects the bottle with a mock-serious expression. mia giggles, patting her rounder belly, relieved that the sensation is more silly than uncomfortable.

mia leans back, her belly still a little round but no longer growing, enjoying the cooling air and the camaraderie of her friends. "Next time, maybe I'll try something less adventurous... or not," she jokes, making everyone laugh. The day winds down with smiles and gentle waves, the memory of the mysterious Bellyquid adding a spark of magic to their beachside afternoon.