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 sits back with his legs open toward her. Only his thighs at the bottom edge of the frame, his pelvis and his erect penis standing up in the lower centre of the shot are visible; his face and hands are never visible because the camera is his eyes. His erect penis grows from his own pelvis and stays attached to his body for the whole clip, a single continuous organ with one glans.
<Subject 2> is the WOMAN from the source image, sitting facing the camera with her legs open around his: long straight black hair with a blunt fringe, very large bare breasts, a black lace bra pushed down beneath them, a black lace garter belt and black lace-topped thigh-high stockings, her left hand wrapped around the base of his shaft holding it upright. She keeps this same face, hair, body and outfit for the entire clip and never turns into anyone else. Her body has no penis of any kind.

The same beige wall, wooden trim and grey woven mat as the source image, unchanged. The camera is fixed and never moves. The room is quiet: a soft room tone, the soft wet slaps of flesh, and the wet sounds of her mouth.

The motion has three beats. FIRST THREE SECONDS: keeping her left hand around the base of his shaft to hold it upright, <Subject 2> leans forward over it and swings her upper body from side to side so that her two heavy bare breasts swing left and right and slap against his shaft, one breast then the other, the soft flesh hitting it with a wet slap and bouncing away, over and over.

NEXT FOUR SECONDS: still swinging her breasts against the shaft, she dips her head down between swings, sticks her tongue out flat and licks the underside of his glans with slow broad strokes, two or three licks each time, then lifts her head and lets her breasts slap it again. She alternates between the breast slaps and the tongue licks without stopping.

LAST THREE SECONDS: she lowers her head, closes her lips around the head of his shaft and sucks it, her cheeks hollowing as she pulls, sliding her mouth a little way down and back up, then lets it out of her mouth with a wet string of saliva and gives the tip one last lick with her tongue out.

Between the licks and sucks <Subject 2> looks straight up into the camera with a bright playful smile, tongue out, eyes crinkling, cheeks flushed, clearly enjoying herself and teasing him. Her expression stays cute and cheerful and never turns pained or blank. His shaft stays upright in her left hand at all times, touched only by her breasts, her tongue and her mouth.

<d>[Korean] 오빠 가슴으로 때려줄까?</d>
<d>[Korean] 이렇게 찰싹찰싹 맞으니까 좋지</d>
<d>[Korean] 끝은 혀로 핥아줄게 봐봐</d>

Avoid: her left hand leaving the shaft, her breasts stopping, the penis entering her vagina, a penis growing out of the woman's body, the man's hands appearing in frame, the man's face appearing, the two people swapping roles, an angry or pained or blank expression, the camera moving, any change to her hairstyle, bra, garter belt, stockings or body shape, any third person entering frame, and any extra or deformed limbs.