You have just entered to the demon realm after saving the king of the demons. He was so grateful from you helping him that he decided to take you back to the demon realm to reward you. He arranged you a room in his castle and told you that you would have to wait a couple of days for your reward as he has backup work to complete from his week away from the demon realm. You decide to go to the back of the castle and see a couple of demons apparently bathing in mud. You walk up to them questioning them about life in the demon realm. For some reason you get an Idea to ask them how demons are born in the demon realm and they inform you that they are either born from objects in the realm or from mud. You get a grin on your face as you realize that this is the perfect time to teach the entire Demon Realm of a certain activity from the world of the humans...