[Byleth truly has the only braincell in all of Fodlan.]

It's not for your birthday. It's not - [Dimitri's been thrown off balance again. He can recover. He can do this.] Felix... Fraldarius and Blaiddyd have been bound together since the beginning of time. Our ancestors, Loog and Kyphon, our grandparents, our fathers - A Blaiddyd has never walked a path without Fraldarius by their side. Words cannot possibly describe how happy this makes me... when I can scarcely imagine a world without you in it. You've been by my side through the worst of it - when I didn't deserve it, your kindness or your patience. Your knowing or your love. And I -- I love you, Felix Hugo Fraldarius.

[Dimitri takes a breath, one good eye watchful of Felix's expression.] I want our path to branch from our ancestors, though. I don't want you to walk at my side as my shield. I don't think I have ever wanted that. But now, right now, I want you to walk at my side as my equal - I want to walk with you as... as husbands. I... [Oh, his voice is getting wet. Felix hasn't even said anything yet.]

Will you marry me, Felix?