It'd be hilarious if Rose just approaches Dirk and is like. "Dirk... I know I'll be getting wedding gifts. Can I make a special request?" He is immediately suspicious but humors her and asks her what it is. "Will you walk me down the aisle? *eyebrow waggle*" He is MORTIFIED, pinches the bridge of his nose cuz it is also such a special thing to ask. Refusing would be hella rude. "Alright. Because it's your wedding I'll do it." Beneath the sarcasm she is genuinely, happily surprised.
tbh roxy will never let dirk live this down, ever, in his entire eternal immortal life