Light Novel Other Size Romance novel I was adopted by a Duchess, but Tsundere's brother-in-law would not admit it. Fairy kiss

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Lucy was taken in by the distinguished Duke family from the old orphanage and became an adopted daughter of Lucy. However, when she met Jude, the only son of the Duke family, for the first time, she said, "I will never admit that I am my sister-in-law!" It was a climax! For a short time, she was told, "No! It's not like I don't want to get along with her." She dyed her ears red and turned her eyes away, and Lucy's Tsunderemoe awakens? Although she is a perfect duke with beautiful eyebrows outside, she can't be honest in front of Lucy. She loved him every day, but when she became an adult, her behavior changed? "You told me at the beginning that you don't admit that I am my sister-in-law, didn't you?" What about Jude's comfortable Tsunderemoe life?