Trust (and no fear).

Mallory is untied and not gagged.
Even so, she knows not to try anything.

It's not like she can just run out of here buck naked anyhow.

He cuffs her hands behind her back and puts a metal clamp around her chest, holding her tits in place.
She doesn't complain.
It will get worse if she does.

She walks towards the metal container as told and climbs into it, facing towards the opening.
'What is going to do to me now?!?'

"Do you trust me?"
Mallory nods.

He tells her to put her legs in and then closes the clear door.

He opens a side hatch on the container and attaches a hose to it.
The thing begins to fill with water.

It fills quickly and Mallory can't believe it!

'Is he serious?!?'
She can't resist.
If she make a move, he might just hang her by her tits again.

If she doesn't make a move, she'll be stuck in here when it fills up!

'What the hell do I do?!?'