Their Hearts Will Beat Together

The faint pop of fireworks sizzled overhead, lighting up their faces and for a moment, they both recognize the other person and pause. But then the world fades back to darkness and everything is okay again, because in the dark they are strangers to each other. Or wherein Robb and Sansa get it on against a tree. Modern AU. PWP. Incest. Sansobb. Very lightly implied Jonrya.