In The Castle: Seong Aneseo Ijongjokdeurirang Seonggyo♥yukamnida

When one’s life mission is to provide a mighty dragon with the sex education he deserves, one needs to really commit. Even if it means you have to spend the majority of your life alone in a castle with nothing but an egg for company. While some might find this solitary lifestyle daunting, Litz is fine. More than fine. He’s found a way to combat loneliness: by pouring his heart and soul into fathering(?) 1,697 sex toys. The day the dragon finally emerges from the egg will be the day that Litz’s babies will finally unleash their true potential...but can Litz bear to wait?
(Source: Lezhin US)
Note: Contains four side story chapters.