Genuinely cute, nubile amateur ticklee who is perky, giggly, petite, fit, and tickle-screamer ticklish
Tickle torturer who is patient, wicked, cunning, devious, and artistic. Perhaps it cannot be done commercially, because there should not be safewords. It can be gentle, but it should be maddening. No nudity needed - certainly seeing a genuinely cute girl being masterfully tickle-tortured to real desperation is incredibly arousing - but tight clothing can reveal enough, and if the tickling is not overtly sexual, then perhaps more girl-next-door subjects could be persuaded to allow their tickle-torture to be recorded.
Have a storyline or a scenario. Quentin Tarantino's character in Dusk Til Dawn, eyeing then 23-year old Julliette Lewis's character...what WAS he thinking of doing with her?
Be playfully evil. If you must give a safeword, use it as a wicked ploy. Tickle her in thin socks or stockings until she uses it. Then, instead of mercy, remove the hosiery and continue, Next time she uses it, add a bit of upper body tickling. Rinse and repeat.
I don't want to see her unable to breathe or in intense pain, but I do want to see her frantic and out of control. You've been tickling her adorable left little footsie for a bit, thin-socked and bare, and she's safeworded three times (you ignored the first two as if you did not hear them), and now, as she pleads with you, her eyes sincere in her panic, you reply, calmly, softly, in a doctor's bedside manner sort of way, "Mmm. I see," and begin to carefully unlace her other sneaker as your assistant light traces a feather about her upper arm, teasing just enough to make her stammer as she pleads, and she knows she can't get away but she just can't take it anymore and it's not going to stop and she knows her fighting it is turning you all on but she has to try and...damn, she's one sexy little bundle of tickle-candy.
Of course, this needs to be consensual. So, she has to agree that once begun, it ain't til it's over.