She surrenders.

"No more," she says through her gag, her will broken, "It is 1983. That's my code. Honest."
"No lies."
"No lies...Master."
"We'll see."

You make a show of going to retrieve her phone and return with it.
Leaning in close, you put in the code and it works.

"Good. I told you I'd let you go from this position if you gave in. Although...

How many times did you have to tell me to stay and play with your tits just now?"
"...six," Starla says, ashamed of herself for many reasons.
"That's right. So you'll stay like this for another 6 minutes then. I'll be back for you then."

True to your word, you let her down after she waits in agony.

She's taken inside to the Living Room in lighter bondage, which alerts Mallory.
A gagged Starla freaks out when she sees where you tied her friend and co-worker.

"I'll let her down when I cum in you. Now ride me, ****."

Torn between her two instincts, Starla reluctantly climbs in your lap and rides your cock while her friend watches in perilous bondage.

It takes ten minutes, but you enjoy it.

"You could do alot better. As such, I'll only let Mallory down after I tied you up somewhere else.
Don't worry- you won't go back to *that* tree."

You drag her away as she tries to plead her case through the ball-gag.
You just laugh.