I believe it is on saturday night, if sami is jealous enough, she will be going through your stuff, if you hide the panties or only have samis in there, you can get her moonstone at corruption 50
Be warned, you need to steal *someone's* panties and then hide them. Even if you never interact with the panty stuff, Lin will automatically hide some in your stuff that Sami will find and mess with the trigger.
