This idea just hit me out of nowhere so I'm still polishing up the details and need suggestions. The story is meant to be one-shot.

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A brother (in late 20s) and a sister (19, 2nd yr in college), both blond and attractive, got lost in the dark while driving the usual route home. They pulled off in the middle of nowhere and found a big, bizarre building glowing alluringly deep in the woods with red, flashy neon sign that said 'Fun House'.

Getting curious, the two went in and were immediately greeted by a sexy, mature woman in heavy make-up and provocative outfit that was like a mix of witch and courtesan. Next to the woman stood a very tall, attractive and broad man in a law-enforcer-like leather outfit that perfectly outlined the man's tan skin and muscular torso. The sister thought she saw the man's eyes unnaturally glowed in the dim light and were eyeing them in an intrigued and predatory manner.

The woman claimed to be the 'Game Host' and said to the confused-looking siblings that this was the house of games that could turn your life up-side down. Challengers were to accept and enter the games at their own wills and risks. There were different games that could be drew from a mysterious box and each game varied in difficulty and prize(money). The brother drew out a card that entailed the game was to last 3 minutes in a duel with the man and the stakes were his life or $100,000. The brother could use any weapons on the walls while the man could use none. Despite being a fully-trained law enforcer, the brother barely outlasted 3 minutes and was brutally beaten up. On the contrary, the man was unscathed,

The Game Host then offered the two to play more games. Should they accepted and won again, the reward would double or they could walked out with what they just won. Plagued by heavy financial burden, the two agreed to venture further so this time the sister drew out the card. The sister immediately blushed as the game host revealed the next game: The same man who just severely beaten up her brother would licked the sister's pussy and if the sister could lasted 3 minutes in his mouth without coming, she won. Immediately infuriated, the brother started to drag his sister out of the house but then the woman cunningly questioned if the money would be enough for tending both the brother's injuries AND covering the cost of the surgery of their mother who was seriously ill. The two froze, shocked and puzzled by how the woman seemingly saw through their minds. After those words, the sister began to hesitate....

That's all I have so far. Any ideas/suggestions that could make the story more tempting/erotic are more than welcome!! Thx