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 kneels between the woman's legs looking down at her. Only his thighs at the bottom edge, his pelvis, his pubic hair, his erect penis and his arms and hands are visible; his face is never visible because the camera is his eyes. His erect penis grows from his own pelvis at the lower centre of the frame and stays attached to his body for the whole clip.
<Subject 2> is the WOMAN from the source image, on her back beneath him: long straight black hair with blunt fringe spread over the white pillow, 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. <Subject 2> never touches herself; her arms rest on the bed beside her.

A POV shot from the man's eyes looking down the length of the woman's body on a white bed. 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 three beats. FIRST TWO SECONDS: <Subject 1> slides both hands under <Subject 2>'s buttocks, cups them and lifts her hips clear off the bed, tilting her pelvis up and back toward him so her anus is raised and angled up at his penis, her knees falling wide apart. Her shoulders and head stay resting on the bed.

NEXT TWO SECONDS: he presses the head of his shaft against her anus and pushes it in, the tight ring stretching open around the glans and then sliding down the shaft as he sinks deeper. <Subject 2>'s eyes go wide and her mouth pops open in a startled little gasp, her eyebrows lifting — a surprised, flustered, cute expression, not a pained one.

REMAINING SIX SECONDS: he thrusts down into her anus at a steady rhythm, deep then part way out then deep again, her hips held up in his hands the whole time and never returning to the bed. Meanwhile he takes one hand off her buttocks at a time so that his hands are also kneading her breasts and rubbing slow circles over her lower belly, fingers pressing into the soft flesh and releasing, working her chest and stomach continuously while the thrusting never stops.

Throughout the clip <Subject 2> looks up into the camera with that startled wide-eyed cute face melting into a flushed delighted smile, mouth open, cheeks red. Her expression stays surprised and cheerful and never turns pained or blank. His shaft is a single continuous organ with one glans and goes into her anus and nowhere else; her vulva stays visible and untouched below it.

<d>[Korean] 어 오빠 거기 아니야 잠깐만</d>
<d>[Korean] 헐 진짜 들어왔어 어떡해</d>
<d>[Korean] 배까지 만지면 나 미쳐 오빠</d>

Avoid: her hips returning to the bed, the penis entering her vagina, a penis growing out of the woman's body, the penis leaving her body completely, a pained or crying or blank expression, the man's face appearing, the two people swapping roles, the camera moving, any change to her hairstyle, tattoo, stockings or body shape, any third person entering frame, and any extra or deformed limbs.