Me, Getting Married for an Alliance? For Real?

[Not sure when I'll start this, so I'll just leave it here for now] Things happened suddenly, and I ruined the alliance marriage between the Uzumaki and Senju clans. My big sister didn't blame me. She smiled and patted my head. My eldest cousin didn't blame me either. He just went back to draping an arm around his buddy's shoulders. Only my second cousin looked at me as if I'd ruined his life. You'd think he was the one my sister was supposed to marry. "So eager to marry into my family? It's not impossible." "...What?" "Then you can marry me. I'll just have to make the most of it." Those words worked like a charm. My second cousin hadn't hit me for three whole days, but then he gave me a warm, brotherly greeting I won't soon forget. Sigh. My second cousin's love is so simple, so unpretentious, and so unforgettable. A few things to know: ● A kind father and filial grandson, brothers who love and respect each other ● The pairing is with Tobirama. I like seeing serious people discipline mischievous kids ● Coming-of-age story (probably), with a little crossover anime content (tentative) Theme: Awaken to yourself through loss, and never forget your original aspirations