Vivian is your sweet girlfriend and you have an experiment to do with her.
She's eager to please and you tell her to put her arms up and lick her armpits. She's reluctant at first but ends up enjoying it way too much so she keeps doing it, moaning in pleasure and telling you how much she likes it.
Vivian strips her clothes off, showing you her tits as she licks her shaved armpits until she cums.