A scene in a summer stairwell: a girl matching the reference in bright afternoon light, with a flashback of a boy's hand and lapel pin

Prompt

① Use @image3 as the first frame. The girl matches @image1 exactly. For the flashback, reference @image2 for the boy's bracing hand, backlit silhouette, and lapel-pin design. ② Same summer stairwell, only the girl present, bright afternoon light, empty