Patty is a researcher and she is testing the effects of a new body lotion that is also a sexual stimulant; Olivia answer to the ad and go to the office to get tested. Patty explain Olivia that she will be tied during the test.
Olivia is only wearing a bra and her underwear. In the beginning Patty start to caress Olivia sides and armpits, asking what does she feel; then she move to her breast and nipples, while Olivia give her feedback. Clearly Patty is trying to sexually stimulate Olivia but she is also tickling her, because she love to tickle, and Olivia is doing her best to not show that she is ticklish so she smile and shiver but does not laugh. At this point Patty start to use the special lotion, telling Olivia that this will make her skin more sensitive, and proceed to put the lotion on Olivia's armpits, sides and breast.
Olivia immediately feel the difference.
All the time Patty has fun with tied Olivia- tickle and lick her sides and nipples, lick and tickle her feet, use vibrator to bring Olivia huge orgasm.

Part 2

Patty is tied up on the sofa, and Olivia ask her if this experiment is not an excuse to tickle and tease other girls, but Patty does not admit it, so Olivia start to do to her the same things she did to her, while Olivia interrogate Patty to make her tell the truth. Olivia tickles and teases her nipples, upper body and feet, with her fingers and tongue. Patty try to resist but the lotion make her super sensitive and ticklish, so she soon give up and reveal that she is using the experiment as excuse to tickle other girls. Olivia continue to torment her with sensual stimulation and tickling, until Patty is having a tickling orgasm with the vibrator.
Once done, Olivia ask her if she would like to have an assistant; and Patty agree.