Photorealistic live-action cinematography, soft even indoor light, natural skin texture and visible pores, vertical 9:16 frame.

There are exactly two people in this clip and their roles never swap.
<Subject 1> is the MAN, whose eyes the camera is. He is off-screen except for his thighs and pelvis at the bottom edge of the frame and his erect penis rising from his own pelvis into the lower centre of the shot. His hands stay out of frame. His penis grows from his own body and stays attached to it the whole time.
<Subject 2> is the WOMAN from the source image: long straight black hair with blunt fringe, large bare breasts fully exposed, a small dark tattoo above her right breast, black lace garter belt and black lace-topped thigh-high stockings. She keeps this same face, hair, body and outfit for the entire clip. Her body has no penis of any kind.

A POV shot looking down at <Subject 2> from the man's eyes. The same white bedding, white pillow, dark wooden headboard and soft even indoor light, unchanged. The camera is fixed and never moves.

The motion has two beats. FIRST THREE SECONDS: <Subject 2> pushes herself up off her back, sits upright on the bed and leans forward on her hands toward the camera, bringing her chest down over <Subject 1>'s erect penis, and looks up into the lens.

REMAINING SEVEN SECONDS: <Subject 2> presses her two breasts together around <Subject 1>'s shaft with both hands, one hand on the outside of each breast, and slides her chest slowly up and down along the shaft so the soft flesh drags over it, again and again without stopping. Between the strokes she lowers her head, opens her mouth and takes the tip of his glans between her lips, sucking it briefly with her cheeks hollowing, then lifts her head and goes back to sliding her breasts along the shaft. She repeats this rhythm — breasts sliding, then a short suck on the tip — over and over for the rest of the clip.

Throughout the clip <Subject 2> keeps looking up into the camera between the strokes with a bright playful smile, eyes crinkling, cheeks flushed, clearly enjoying herself and teasing him. Her expression stays cute and cheerful and never turns pained or blank. The shaft stays a single continuous organ with one glans, held between her breasts or at her lips at all times.

<d>[Korean] 오빠 가슴으로 해주는 거 좋아?</d>
<d>[Korean] 끝만 살짝 빨아줄게 봐봐</d>
<d>[Korean] 이렇게 하면 금방 나오지</d>

Avoid: the woman lying back down, her breasts leaving the shaft for long, the penis entering her vagina, a penis growing out of the woman's body, the man's hands appearing in frame, the two people swapping roles, an angry or pained or blank expression, the camera moving, any change to her hairstyle, tattoo, stockings or body shape, any third person entering frame, and any extra or deformed limbs.