There has been a long pause while I have considered the next step in this story. Only managed a little research...
The film is within the story as developed so far, you know the actors, for the most part.
*****
Nina is delivered to the door blindfolded. The camera angle is from behind her as we watch the door open for her. A stunning woman takes her by the elbow and leads her up the three shallow steps to the interior hallway. She hears other people moving as she is guided deeper within the building. We see three men that turn and follow her with their eyes.
She is stopped, the woman's hand on her elbow insists. A tall man steps to stand beside her, opposite the woman. The camera's view is full-frontal as she is handled and stripped. The two begin to work at her clothing. The light dress is untied from her waist and pulled roughly down from her shoulders. She hears it tear slightly and then it is around her naked feet. Nina stands bare but for the blindfold. She has not known underwear for a year, now. Her breath comes in short pants from fear.
The big man's hard hand grips her breast, hefts its slight weight then squeezes. The woman's hand feels the muscles of her bottom and thigh, testing the texture and resilience there. That hand probes between her legs, brushing the soft wet flesh there, for just a moment. The girl trembles.
"You need not know where you are, or who we are, little slut. You need only know what your purpose here is. You have consented to be here, without knowing what your fate will be, have you not?" The woman's voice sounds clear and hard.
She speaks softly to say "Yes, I consent, whatever it may be."
The woman's slim fingers touch the girl's lips, in the gesture of silence. "Once each week you will be asked to reconfirm that choice. Otherwise your word is 'Red Light. Should you use it, you will be released out the door immediately".
"From now until you leave here, you will not otherwise speak again. Your mouth is for the pleasure of other men and women. Your voice will be only for your screams, grunts and moans. Any words will be punished. Do you understand?" The woman's lips are close to her ear, the voice quiet, yet very certain.
Nina's "yes, miss", is followed by a loud slap to the side of her face.
"No words, slut. You will learn painfully if you are slow". The older woman strokes the site of the slap, feeling the wetness seeping from beneath the blindfold. Her damp fingers trail down the girl's throat, then across the slope of her breast. She grasps the nipple firmly and pulls the girl by it to follow her as she walks.
Stumbling and waving her arms for balance in her darkness, she manages to stay on her feet. A hand-held camera is a few paces behind, capturing the action. Twenty paces later, after two turns painfully signalled by the mistress' grip, Nina is released and told to; "stand, legs apart, hands behind your head."
The blindfold is snatched from her eyes and she blinks in the bright daylight flooding in the windows. The room is quite large, eight or ten paces square, roughly. The girl's eyes gradually adapt to the harsh light and see the lawn stretching towards the distant sea, far below. There are french doors at each side of the glass wall.
She turns to look at the rest of the room, as the beautiful woman calls through the door where they had entered. The door is a pace from the padded platform that occupies most of the rear wall. This is low, at knee height and about the size of a king-size bed, but has only a leather mattress that looks thin. The other side of the room has an alcove with what looks to be a squat toilet-cum-shower.
The corners at the foot of the platform have columns from floor to ceiling. There are eyes bolted into the columns. At the head of the platform is a stone wall, painted white. An iron bar runs horizontally across the wall, too high to grab. She looks at the set-up and her trembling turns to sobs, as the reality of her choice sinks in.
The camera focuses closely on Nina's face, her emotions are going to make this film pay off. She has fine high cheekbones, wide spaced eyes, now moist, and rich sensual lips that befit her well for this role. Black wavy hair just short of her shoulders frames her face.
The woman calls loudly in a strange language to someone who answers in that language, from a distance. There is a squeaking noise that gradually comes closer. The beautiful woman returns and grips the girl's head to face forward again. She moves to stand in front of the weeping girl, who is a little shorter, and lifts her chin to kiss her on the mouth. The kiss deepens, and the girl feels her body calming as she submits. Later, Nina will remember that small compassionate moment.
A tiny whirr comes from a camera as its focus tightens. Microphones collect every sound, but the software will deal with the trivial.
The squeaking reaches the room and proves to be a trolley carrying a kind of bench. The man pushing it is tall, slim and muscular, wearing a tight T-shirt and jeans. He pushes the trolley forward on the tiled floor until it is between Nina and the window. The room is big enough that there is ample room to move around it on all sides.
He unloads the trolley and sets the bench on its feet. It is waist high, with splayed legs and a padded top, about a metre and a half long. There is mechanism of some sort under the top. He says something to the woman, who replies, then he takes the trolley back out the door. She can hear the squeak retreat for some time.
Nina's tears have ceased and she closes her eyes as she feels a soft hand caressing the bruised breast, then stroking across her belly and down between her legs. She flexes slightly to allow the hand more access. Her breath comes more deeply as she feels her cunt become wet with a finger probing into her.
The woman is careful to keep the camera's view clear. As her shoulder-length light brown hair moves, a fine wire is visible leading to her ear.
When she opens her eyes again the man is back, carrying a suitcase sized piece of technology and a bag of tools. He puts it all on the floor, unrolls the cord and looks for a socket to plug it in to. That done he goes back out and soon returns with a chair and a sheet of thin leather.
He pushes her backwards until she sits on the platform. He keeps pushing her in the middle of her chest so she must fall back on the pad. He seizes her left ankle and wraps the leather around it. The woman holds her shoulders down so it is hard for her to see.
He pulls on heavy gloves and a thick jacket. He puts her ankle on the seat of the chair, with a piece of scrap ply beneath it. Nina feels a metal band go around the ankle and she flinches, but can't move. With an ugly mask he strikes his arc and swiftly welds the band around her ankle.