might i suggest
Cosima’s on the floor next to Helena, trying to stop Kira from swindling Sarah’s sister out of all of the good candy (“Helena, you can’t trade a Tootsie Roll for a Snickers, that’s just a recipe for sadness”) and Sarah watches them, a fond smile tugging up the corner of her mouth. Behind her, at the front door, Alison and Tony are taking turns handing out candy; right now it’s Tony’s turn, and Sarah can hear him exclaiming over some kid’s costume, doing werewolf growls.
"Busy night!" chirps Alison, having moved away from the door (no awkward twin stories) to stand next to Sarah, but she’s glowing from some Halloween high, the joy of well-done decorations and escorting your shrieking children from door to door; she beams at Sarah and Sarah smiles back, thanking the powers that be again for her family.
Send me characters and a situation and I will write you a three-sentence fic!