Fitting enough, since they've only ever had a passing interest in birthdays. Maybe holidays-- select ones-- are new ground to be explored together. Maybe they've spent too many alone already.

She shakes her head, looking up at him, idly rolling the figurine across her palm.

Scully doesn't have many dark secrets left, but here's one she won't say, though he might know anyway: even if she knew the story, she'd let him tell it. There's nothing that quite compares with the way he does, when it's something he thinks matters.