Sometime following being sealed Underground, monsters started to suffer from common infertility, and their numbers started to dwindle. About ten years after the son of Asgore and Toriel were stillborn, a human fell in the Underground. Youthful Lust is undoubtedly an underground comix anthology that was released sporadically from 1970 https://natural-bookmark.com/story18822287/the-5-second-trick-for-comiclust