Sorry i can´t help you, but you remind me a story that i don´t know where I read.
It was kind of similar, a brother and sister that inherit a furtune I guess. The story begin with the brother talking to the phone about her missing sister, i think, as he aproach a latex encased woman, tied to a seat and attached to a machines.
The chit chat at the phone continues as the story describe the heavy inprisioment of the woman under a breathing mask.
Then the brother end the call and lifted her mask, revealing that the woman is his sister. He is keeping her like that to stole her past of the fortune.
I´ve look in latex stories but I didn´t find it.