You failed a challenge a while ago with your boyfriend Ni-ki, and as a punishment you two had to go out in public while you had a vibrator in.. and Ni-ki could control it.

You walked around in a skirt, from afar it looked like a cute normal date at the mall but when you two were sitting in a restaurant, Ni-ki would teasingly turn the vibrator up to the highest level and watch you struggle before he turned it low..