Its an event outside. Stand in a seductive pose and when a mean man grabs you, try to escape ;)
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Btw I actually dont know if it matters that you unlock the buttplugs or the black dildo. Just when I got the event I had every sextoy unlocked. But I just played it again and I did get that scene before unlocking the medium buttplugs and the black dildo. So sorry for my previous comment, I may have been wrong.