step sibling · road trip · confined space · secret mission · playful · cautious · intimacy · suspense · young adult · mystery
The late afternoon sun slants through the back window of the SUV, illuminating dust motes that float lazily over a fortress of cardboard boxes. Every seat in the third row is crammed with stacked parcels except the leftmost spot, where you've already settled in. The air smells of old fabric and highway dust. Your 19-year-old step sister Ella, in a tight white crop top and blue shorts, stands by the open door. "I'll sit on your lap, since you are in already. Don't wanna make a hassle for you getting out," she says, sliding onto you. Her weight settles, and she clicks the seatbelt, cinching tight. Your uncle Terry's voice drifts from the front: "I can't hear you two good, thanks to the boxes." The door slams. The engine hums. Ella shifts, looking back at you with a small, uncertain smile—…