So he doesn't know what a curveball is precisely. But the name and context clues give him enough not to question it beyond a soft snort of amusement. Which melds into a pleased sigh. His arms curl tightly around Felix in turn.

What he's most grateful for is that Felix doesn't fight him on this. It's probably the benefit of understanding exactly why Sylvain is apprehensive of marriage in general. Also the fact that apparently the Sylvain from before worked past it. In truth, it puts Sylvain himself at ease. Maybe he can't handle it now, or even fathom how, but somewhere down the line, maybe it won't make him flinch. If it makes Felix happy, Sylvain thinks it'll be worth it in the end.

Reluctant to let go, Sylvain is happy to linger close when Felix says he loves him. He hadn't exactly meant to use that word earlier, but it had slipped so naturally. Really, he's always loved Felix. He's loved him so long it feels strange to consider a time when he didn't. It just took a while to understand his feelings ran deeper and differently than only 'best friend.' Admitting it aloud to Felix himself was far easier than Sylvain imagined. Having the sentiment returned so sincerely, Felix holding his gaze and all, leaves a blooming warmth in his chest.

"Thank you," he gusts out, the relief plain in his tone and expression. He should probably say more, but he thinks Felix will understand how much it truly means to him on just that.

Sylvain brings a hand up, brushing along the line of Felix's jaw. An affectionate touch meant to coax Felix to tilt his head just so.

"I'd still like that kiss if you're offering."