Steph struck a pose and did a twirl for the audience. Her black mini dress barely covered her ass and her perky breasts stretched the fabric appealingly. The Magician had asked for a couple from the audience to help with tonight's trick and Steph started to scan the tables in the dimly lit club looking for likely candidates.
The pair she led up onto the low stage were in their late twenties. He was tall, attractive and well muscled, a shy smile slightly at odds with his assured good looks. His partner was a pretty blonde whose mini skirt and halter top hinted at an adventurous personality. Ideal.
The Magician explained to the hushed crowd that tonight Steph would be attempting an apparently impossible escape and that his helpers were here to ensure no trickery or cheating. On cue, Steph pulled the straps of her dress over her shoulders and wriggled it down over her hips. Her toned and tanned body was quite nude beneath. She walked back and forth across the stage and smiled at the Magician's old jokes about hidden trapdoors.
Steph took her position in the center of the stage and took a deep breath as the couple started to add her bonds. Manacles around her ankles. Straps with ratchet tightened fasteners to jam her calves and thighs together, each click causing her to wince. They certainly were not shy of following the Magician's advice to make sure everything was good and tight. Her legs throbbed as the pulse fought past the tight bindings. They added a few padlocks as they went, each lock being from a freshly opened package, and each set of keys held only by one or other of the helpers.
Steph smiled, knowing she was only going to get less comfortable. A small wooden box was wheeled on stage, a cube maybe 2 ½ feet each way. Steph was lifted to a standing position in the box then invited to kneel and fold herself into the box. She grunted as she wriggled into the confined space, made doubly difficult by the bonds already added to her lower half . By the time she was low enough in the box for her neck to be level with the top, a slight sheen of perspiration glowed on her forehead.
A lid was added to the box next. Steph raised her hands as the top of the lid formed a set of stocks trapping her wrists and neck in cut outs in the thick wood. She winked and used her lower vantage point to admire the legs of the girl helping as padlocks were added to the lid  on all four sides. The Magician asked the couple to confirm that all the bonds, the locks and the box were quite real and Steph's escape looked impossible, which they were happy to do.
Steph scanned the audience for reactions as The Magician added that he was worried the escape would be too easy. Steph shook her head theatrically right on cue. She looked odd in the small box, only her trapped head and hands visible. Steph grinned, watching people trying to work out where the Magicians tricks were going to go was always great fun. She felt her pulse racing a little as she tingled with helpless excitement,
The Magician announced he was ready to complete Steph's dilemma, and a large metal contraption was wheeled out. He explained in some detail that the metal tank contained quick dry expanding foam that he was about to pump into the box, entombing Steph up to her neck! Although the foam was quite safe it would set just has hard as concrete. The audience were shocked, and the couple on stage as helpers looked nervously to Steph, worried about what they were taking part in. Steph gave them a reassuring smile and a knowing wink as the Magician finished explaining that the foam would be set in less than 15 minutes. As he spoke a tube was led to Steph's box and fitted to a small hole which opened behind her trapped neck.
Steph closed her eyes as the pump gurgled. The cold wet foam flowed around her and would soon be slowly setting, rendering her totally immobile as it did, its inexorable expansion squeezing her ever tighter. The Magician stopped the flow at about ½ way. He invited his intrepid helpers to peer into the hole and confirm the box really was half full of foam. He also had them tip the keys for the various padlocks used in confining Steph thus far into the slowly setting mix. A few more moments with the pump and the foam had reached the top.
Steph watched with a smile as the show continued. The guy returned to his seat, but the girl agreed to act as the Magicians helper, as Steph was a little indisposed right now, left to one side of the stage in her solidifying tomb. She could barely wriggle inside the box and anyway her hands were trapped on the outside in the stocks that formed the lid.
Damn Steph thought, that girl is cute. And a performer too, adapting quickly to her new role. After about 20 minutes of sleight of hand acts with his new assistant the Magician returned his attention to the helpless Steph. He had his new girl help him pull away the front and sides of the box, revealing a solid cube of the mottled gray foam totally encasing his original assistant. The little wheels facilitated a quick 360, she was definitely stuck in there.
Steph smiled. She loved this trick. Squirming in her box she could feel the inescapable sludge tightening around her as it set. The Magician was busy asking his helper if she was enjoying her new role and if she fancied taking Steph's place for the rest of the show seeing as how  the escape attempt didn't seem to be going so well.
The girl happily agreed, revelling as she was in her 5 minutes of fame. The pair walked over to the solidly trapped assistant and the Magician offered the girl a small hammer to allow her to check it was indeed now rock solid.
As the girl bent to tap the face of the block, the Magician threw something to the floor. There was a loud flash, a small puff of white smoke and a strangled scream. Steph smiled and took a low bow to the huge applause that spread through the club as cloud of smoke quickly cleared. She grinned as people slowly realized what had happened. Steph was stood to one side of the block, brandishing a small hammer, dressed in a halter top and mini skirt which seemed all the more mini on her long legs.
And the girl? She watched in horror, hands waggling helplessly from her place in the solid gray lump. The applause echoed round the theatre as Steph strutted to the poor girls partner and asked him to confirm she was wearing his hapless girlfriends clothes, then led him up on stage to allow him to check she was indeed trapped in the solid block.
The Magician brushed aside the girls complaints, pointing out she had happily agreed to taking Steph's place for the rest of the show and waved as the she was pushed to the side of the stage, explaining everyone would see her again at the end of the show.
Steph took her rightful place center stage, and did her best not to fall out of the borrowed clothes during a seductive dance which accompanied the final close up magic items. Her heart was pounding, the show was almost over, and she knew it was time for her to discover what surprise trick the Magician had in store for her this time.
As she watched, pulse racing, the Magician opened out a sack made of soft black velvet. He twirled and folded it to prove its emptiness, then set it on the floor in front of Steph, neck opened. Steph smiled as the Magician took her hand and she stepped onto the sack, then she waved and the sack was drawn up to her neck. Barely pausing the Magician drew the sack the rest of the way over Steph.
A second later the sack was dropped and slid once more down an attractive naked body, this time of the girl from the audience. She blushed furiously and tried in vane to cover her modesty to thunderous applause. Without further ado, the curtain fell and the lights dimmed.
As the happy crowd filed out of the club, many noticed a new addition to the small garden under the clubs porch. At the end of the wall a new block had been added, with a small but neat flower garden set out around it. The mortar adding the new block into the wall was still wet. Steph smiled weakly, only her head and hands visible sprouting from the top, her cement bondage now set solid. The Magician felt that over the next few days she would generate plenty of interest for the next show.