You know how public places are… always suitable for a quick shag.
And either Nj Sung loves practicing it, looking at it or he’s just obsessed with exaggerations of the dirty act. Like the famous pornographic comics & animations his neighbors have been growing up with for a few centuries now.
All the way from South Korea, Sseongnakjin has kept developing his dirty pop art after graduating from Hanyang University and dedicating big part of his time to body adoration. Some of his works (mostly from his Public place series) can now be bought as prints via SO but you can always visit his blog for his other less carnal fantasies.