Two friends, one selfie

Generate a ten-second vertical front-camera video of two adult university friends sitting in an empty lecture room after class. One wears a blue track jacket and holds the phone; the other, in a green cardigan, leans into the background. Begin with both trying to maintain serious faces. At three seconds, the friend behind raises one eyebrow, causing the person in front to suppress a laugh. They briefly exchange positions by leaning sideways, then settle back into the original framing and smile together. Keep faces, hair, and clothing unchanged. Use stable afternoon window light, minor arm movement, natural focus, quiet room echo, and spontaneous laughter without cuts or beauty-filter effects.