I like the tricked scenario, so one idea might be girl has a 3:00 appointment for a tickle video. Friend tells girl to be there at 2:15 and she will help her set up to make the producer happy.
She tells the producer that her friend agreed to do the shoot nude and gagged.
She gets her friend all tied up, teases her a bit to warm her up then makes her orgasm.
Proceeds to put the blindfold and gag on her friend, reaches behind and removes her top and snips off her underwear.
Producer comes in sees the model is ready, docs with authorization is signed.
He notices that the one hour box is checked and signed, thought she was going to only do a half? No she really needs the money so she agreed to nude, gagged, one hour strict bondage.
Not that many would be into that scenario but I think its hot, girl is sensitive as hell from coming, friend gets payback and even joins in torturing her friend the last 15 minutes or so.
Maybe even after the shoot is over she tells him she will wrap things up and untie her friend, then torments her a bit more.
Then do a sequel with revenge?
Just a thought