DDN-152 What if the morning commuter train was packed with couples doing crazy kisses?

In a crowded train in the morning where you can't move, a couple of couples flirt and eventually start a rich kiss. The surrounding people who seemed to be annoying and envious. Eventually libido and estrus are contagious. An abnormal space where body temperature and humidity rise. Women who don't have a partner are frustrated and beg a nearby man to kiss them...