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I knew that I could had reported the Wyvern Egg to the Duke or the Chief so they would had known what attracted the Wyvern here, but I was sure the Duke might had kept it for his own family, or even sold it. Therefore, I prioritized my own gains and kept the egg for myself instead of talking anything. Like that, the egg has been slowly developing within the underground hideout for the last days.
Through these days, the Duke had finally gone back home, with no notices about Erika's mother yet, but he had promised that he would send a message with a servant whenever he would get some news. For the moment, my plans had not changed much, I was still going to spend the next years here until I could be of age to go to the academy and level up further in there with the many dungeons they own.
Check "The Protagnist's Sister Is Actually the Strongest"!