I Raised My Younger Sister Beautifully

The imperial family collapsed in one night. By Basilisk, the summoner of darkness; summoned by Fletta, the Cursed Princess.“If there is a next life… Can I really be your sister?”Would it have been different if I had approached you a little more?It was the last time everyone regretted it, and like a miracle, time returned to six years ago. If this is the second chance given to us…‘Yes, I’ll heal you. To prevent the awakening of the Basilisk’s darkness.’So I decided.“I look forward to your kind cooperation, Grand Duke Darian. No, Kylia.”I decided to marry Fletta’s maternal uncle, Grand Duke Kylia.I thought there would be no problem because it was a one-year contract marriage.“Honey, ah, try it.”“You have no idea how much I like you.”“I will continue to like you. I want to express my affection to my heart’s content… Can’t I?”What’s wrong with this guy?When I try to save Fletta, the Grand Duke comes along with me (?)Aren’t you the Monster Grand Duke…?