My Grandfather Is a Paragon [Crossover]

They say people are especially vulnerable when they're sick. So, after laying the groundwork, Steve Rogers hesitantly, nervously, and somewhat awkwardly said, "Maybe I'll become your guardian someday... In fact, you might want to call me Great-Grandpa." Lydia: "..." Lydia didn't even bother to sneer. She deftly pulled the needle from her hand and said in a cold, contemptuous voice, "Maybe after I knock some sense into you, you'll suddenly start calling me Great-Aunt?" Steve Rogers: "..." Steve covered his face with one hand, looking pained. "...Don't be like that. Can't we talk this out?" Before they became family: Captain America: Who needs saving today? Criminals: Where can I find my enemies today? After they became family: Captain America: Today, I'll keep working hard to save another wayward girl. Criminals: Today, I'll keep trying to shake off this clingy living fossil. In a nutshell, every day Captain America is thinking, "Cold leaves drift down and cover my face. My great-granddaughter's rebellion breaks my heart." Reading Guide: 1. The female lead is an underage delinquent and criminal. Her whole family is dead, she's a mutant, and she's strong. 2. After Captain America becomes her great-grandfather, his daily tasks are to straighten out her values or trade insults with her. 3. I don't know who the male lead is. Don't ask me. The pairing is unclear, and whether there will even be one is undecided. That's that. 4. The timeline is a mess. I just want to write a young, handsome Professor X and Magneto. No nitpicking from continuity buffs. Upcoming Story: Gender Error If you try to lock me in a cage, I'll smash you and the cage to pieces. P.S. This is a sci-fi ABO story. No bugs. The female lead is an omega, she doesn't join the military, and the general isn't the male lead. She's wild and free, a powerful fighter, and her mental strength barely passes. Upcoming Fan Fiction: The Female Lead Sends You to the Afterlife Quick, efficient, safe, and painless. Female lead: Don't worry, I'll do it myself. Other Completed Fan Fiction: [Crossover] Her Dad Is Fierce A silly father-daughter duo. Every day, they both think the other one doesn't love them. [Crossover] Every Time I Jump Off a Cliff, I Start a New Instance Tsukuyomi Yoichi Claims to be an African chieftain, but is actually European royalty. Theme: