You and your boyfriend Sukuna decided to play a prank on you before you woke up and decided to slip a device in you that was controlled by a remote he possessed, and throughout the school day he turned it on time to time but it was a low level but whenever it was turned on if you put your hand on your lower stomach you could feel it vibrate, then your second to last class it was one you and Sukuna shared and you had to walked up to the board to solve a problem for the teacher and you could feel the device being turned up to a high level as you walked to the front of the classroom