Expand both cheeks briefly and return without changing the mouth

Original, untested video brief. No input image or generated result is supplied.

1. Task and boundary

Show both cheek surfaces becoming gently fuller, then returning. Track the cheek outline and the shading of each cheek together, using the nose and mouth as stable references. A light patch getting brighter is not enough: the local surface or outline must visibly change. Keep the same face and the same closed-mouth boundary throughout the short action.

This is a visual animation brief for a mild, ordinary cheek puff. It is not a breath-holding exercise or a respiratory test, and it specifies no pressure, duration target or physical performance requirement. Do not add blowing, a balloon, forceful straining or a change in lip shape. The useful distinction is cheek volume change while the mouth stays closed.

2. Authorized first frame

Use an authorized image or drawing of one consenting adult, with rights to animate the source. Start with relaxed cheeks and lips gently closed in an almost frontal view. Include the complete face, chin and upper shoulders. Both cheek edges should be clear of hair, hands and accessories, and the background should differ from the skin tone.

Keep a little side lighting to make the cheek surfaces readable without deep moving shadows. Avoid a very wide-angle portrait or an existing smile that already changes the cheeks. Preserve any natural asymmetry. If a broad face shape hides the outline change, choose a slightly oblique view that still reveals both cheeks rather than asking for a larger puff.

3. Use the generator

Open the current image-to-video generator in a mode accepting your authorized first frame. Paste the complete prompt, check the available settings and cost estimate, then submit only when ready. This page supplies text; it does not upload an image or start a generation.

4. Prompt and timing

Begin from my authorized portrait of the same adult with relaxed cheeks and gently closed lips. Fix the camera, head position, nose and chin. Let both original cheeks gradually become a little fuller in one brief, mild puff. Preserve the closed-mouth seam and its starting width; do not purse or open the lips. Keep the cheek skin and existing facial features attached to the same face. Show a readable moment of fuller cheek contours, then let both sides return continuously to their original relaxed shape. Keep the shoulders still and the gaze steady. Do not enlarge the entire head, inflate the lips, move air as a visible object or add a balloon. No strained expression, held-breath countdown, speaking, cut or repeated puffing cycle.

Opening: note each relaxed cheek edge, the closed mouth width and the fixed nose position.
Middle: compare the changing cheek surfaces with those stable landmarks and check both sides separately.
Ending: follow the decrease in fullness until the original cheek contours return.

These beats are author suggestions, not exact model timing guarantees. Adapt their proportions to the clip length actually available.

5. Inspect the output

After inspecting your own output, record a time or frame, visible observation and pass, fail or inconclusive judgment for each condition. A convincing ending alone does not verify the preceding action.

Both original cheeks become visibly fuller without the whole face scaling up.
The mouth seam stays closed and near its starting width.
The nose, chin and head remain stable enough to compare the change.
Facial texture stays attached instead of stretching into a new face.
Both cheeks return continuously rather than collapsing in one frame.
If only lighting changes and no surface or contour change can be seen, mark the puff inconclusive.

6. Fix one failure

The whole face swells: constrain the head outline outside the cheek region and reduce the effect.
The lips project forward: restate the original mouth width and remove blowing cues.
Only one cheek changes: request both sides while retaining the person’s starting asymmetry.
A smile replaces the puff: remove playful or happy expression wording and keep the mouth neutral.
The release snaps back: assign a separate gradual return beat and shorten the peak hold.

7. Ending and limits

Finish with the same relaxed cheek contours and closed-mouth boundary seen at the opening.

Save your own generated result through the available result controls, together with the authorized input, exact prompt, settings and inspection notes.

No output, airflow reading or physical trial is supplied. A visible animation cannot verify air pressure, breathing, comfort or health. The checks concern image continuity only; uncertain shading should not be reported as confirmed volume change.

See Eyes first, head second: a small gaze-and-turn exercise for separating visible facial landmarks in a portrait. Keeping the nose and gaze steady is useful here too, but the requested event is bilateral cheek fullness with an unchanged mouth. Do not count the related page as a cheek-puff demonstration or substitute its head turn for the local cheek change.