headcanon that when the hargreeves realize they never threw a debutante ball for vanya, they then spend the entire year leading up to their birthday planning the best party ever, all for her:
but of course, klaus can’t keep a secret when he’s ‘self-medicating (with moderation!!!!)’ so he goes ahead and tells vanya one night when they’re out drinking, and pinky-swears her to secrecy right after.
so imagine vanya having to pretend to be surprised, but being surprised for real anyway because holy shit, there are balloons and streamers and banners everywhere, and is that an honest-to-goodness chocolate fountain?
and after they’ve blown out the candles on their cake, luther pulls out three white roses from nowhere, hands them to her, and leads her onto the dance floor while strains of classical music play in the background. it’s slightly awkward, but luther is just as clumsy as her, if not more so, and she finds herself laughing along with him.
diego’s next, and where luther was lumbering and slow, diego is nothing but lithe and graceful. he spins her around and around until she’s giddy with dizziness. when he presses his roses into her hands, he gives her nose a little tweak, just like he used to do when they were children.
then there’s allison and she forces klaus to change the music, and they spend their moment twisting and turning around the dance floor because her sister has clearly learned a thing or two from her time in the ‘60s. it’s wild and messy and fun, and by the end of it, they’re simply swaying from side to side with their arms wrapped around each other.
five lets her lead, just like he did when they were children because he knew just how much she loved feeling in control, and it’s weird because he’s so much taller than her now, even at fifteen (sixty? oh well, who even bothers to count by this point), but they manage, and the roses he hands her are the same shade of blue as sissy’s eyes. in return, she kisses his cheek, genuinely touched at his thoughtfulness, and laughs when he makes a big show of scrubbing at the spot with his sleeve.
finally, klaus struts onto the floor, twirling around a couple of times with his arms spread wide, acting as if they’re in a theater filled with people instead of their childhood home with its last six inhabitants. he bows low and deep, all his movements exaggerated, and vanya plays along with a curtsy. the music changes to something more modern, so she lets klaus lead, ignoring diego’s jokes about how tiny she is compared to their brother, and when it’s time for his roses, he hands her twice the amount their siblings have already given her, and whirls away before she can ask why.
before she can go after him, allison cranks the stereo as high as it can go, and vanya feels another smile creep onto her face when she hears that familiar beat followed by “children, behave…” and she barely gets to set her bouquet aside before they’re all crowding around her, jumping up and down like a bunch of teenagers at a rave, hollering the lyrics at the top of their lungs, and despite the fact that diego can’t keep a tune to save his life, vanya just closes her eyes and loses herself in the music.
later that night, when they’re all cuddled together in the living room after klaus had insisted on building a fort (”it’s tradition!” “liar, we’ve never done anything like that!” “well, we do now!”) and she’s sandwiched between a snoring luther and him, she taps his cheek and asks “why six?” and her brother simply smiles at her, those familiar green eyes twinkling even in the dark, and gives her forehead a light peck: “well, of course, vanny. you aren’t alone at the table anymore. and ben says hello.”
