it's rng and gives your credit each time events happened during the quest
most describe it as few in game hours though
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everyone has different preferences it's up to you if you like the kink or not only thing about the portal panties no one even forces them on others it's only you who can get and force it on others and i think the random events that play out with it don't happen to the ones that have the panties only you so the content on it doesn't last long for the game and for you as it gets boring doing the same thing over and over again