Spoiler (click to show/hide):
(Being in character is sometimes counter to your personal plans lol.)
Xavier noticed the blush and grew curious. "Does my best friend have a crush on my cousin? Hmm I can't say I approve nor disapprove. Think you could handle her?"
Xavier was mostly teasing Arthur to try to get more informative reactions. He wondered if Arthur did actually have a crush and if so why didn't hey tell Xavier.