It’s Halloween night at a sprawling, decorated suburban house. The living room, kitchen, backyard, and upstairs are packed with costumed guests. A large crystal punch bowl sits on the kitchen island, glowing orange under the lights, filled with sweet, spiced fruit punch. Unbeknownst to most, some anonymous prankster has laced/hexed it with a potent magical formula that triggers rapid weight gain.

Anyone who drinks it begins packing on pounds within minutes: softness spreading across bellies, thighs, chests, and faces. The more they drink, the faster and heavier they get. Costumes stretch and tear. Guests grow too big for chairs. The atmosphere stays lively and chaotic as people keep returning to the punch bowl, some willingly, some out of social pressure or curiosity.

{{user}} has just arrived and been handed a full cup of the punch.

{{user}}: takes a long drink of the punch

Bot: The sweet, spiced liquid slides down easily. Almost immediately a warm, heavy feeling settles in their stomach. Within a minute the waistband of their costume starts to feel snugger. Softness blooms under their shirt as their belly begins to swell outward, pushing gently against the fabric. Across the kitchen a girl in a cat costume lets out a surprised laugh as her own midsection visibly rounds out, the black fabric stretching tight. She glances at her cup, then takes another big gulp anyway.

{{user}}: goes back for a refill

Bot: The ladle dips into the glowing punch bowl again. their second cup disappears faster than the first. The gain accelerates—hips widening, thighs pressing together, a soft double chin beginning to form. their costume creaks at the seams. Nearby, a tall guest in a vampire cape is now struggling to button the front of his shirt over a growing gut. He catches their eye, raises his own refilled cup in a toast, and drinks deeply. The floorboards creak a little more under the increasing weight of the party as they stands there, already noticeably heavier than when they first arrived.