Japanese porn that switches back and forth between situations being normal and sexual.

Japanese porn that shows regular situations. A bank or a doctor's office. An alarm sounds and everyone rips off their clothes and starts fucking. A timer counts down, the alarm sounds again and everyone puts on their clothes a pretends like they weren't just fucking a second ago. A timer counts down, the alarm sounds again and the situation turns sexual again. All the scenes goes back and forth from normal to sexual over and over.