Duolingo™ isn't only a beneficial
tool for those wanting to acquire a new language. It also has gained popularity among language enthusiasts. However, unfortunately, it seems that even this popular platform also falls victim to the infamous Rule 34 dictate.
There are countless people discovered that Duolinger + rule 34 union exist. It could come as a surprise, but apparently, there are indeed fan-made illustrations based on characters from Duolingo which abide by the infamous principle stating that "if it exists, there is porn of it."