the sun, the moon, and stars between

in which Sirius discovers he has a sister, who falls in love with an idiot

"If I'm the sun, what does that make you, you're certainly not the moon." He laughed
"Maybe I'm the gravity that holds everything down?" She smiled that self-deprecating smile.
"No, you hold no one down. In a way, you're always there but not always seen, no one can hold you back, and you always tell a story, like the stars. You're all the stars in the galaxy."

#1 in OCXOC on 1/15/21