This uncle is fucked in the head. Even if he got the wish he wanted and the cousin he loved was revived it's not like she would love him, she married his brother, not him. Plus, she would probably be put off by the dude being a creepy fuck who had already summoned some canine demon to take up her appearance. What a shit wish, his nephew had a better idea, Yuu is baller getting an eldritch ancient god to act as his older sister and protector.