[There's a moment of hesitation before answering, but it's just plain old awkwardness, nothing complicated.]

It's, uh — we've sort of been doing this thing, one of us will surprise the other with a date? My turn this time, that's what I'd been practicing scones for. I've got a whole picnic planned, should be a nice afternoon.

[Even better now they've sorted out some issues and there's not lingering background anxiety.]