You can if your inhibition is low enough to flash with out panties.
Not in the code that I looked at.
The piece I looked at started with "act 'Tease Svyatoslav':"
If you follow this, you get one choice, Sonia's suggestion.
From there, you can Refuse to flash if you have wp. You can also:
act 'Flash your boobs':
then
if $pantyworntype ! 'none': (meaning you have panties on):
Flash Panties, raise skirt, and show pussy.
There is no else statement on that for what happens if she is not wearing panties. In that case, no additional options are given - just the original option to show boobs.
The option to remove panties is not tied to the teasing, but to the general Not Paying attention in Class task.
Anyway, this is not something that bothered me, but I thought she should be able to flash her pussy when she was not wearing panties, but that does not seem to be the case in the teasing tasks (normal disclaimers go here that I may not be reading the code right, you guys are the experts, just pointing out how it looks)