Akai kaben ga nureru (1977)

Skinny Asian girl, early 20s, long black hair, pale skin, long eyelashes — she’s in every frame and does the whole thing solo at first, then gets joined by a dude off-camera. Starts in a dim dining room, then bar, rooftop, but the sex is all in a bedroom lit by candles. She’s on her back with her legs up, getting plowed in missionary, then flips to all fours — doggy style with deep, slow strokes. You see her face the whole time, mouth open, actually looks into it — not faking. Later she’s riding him reverse, grinding back with her hair hanging down, sweat on her shoulders. The lighting keeps it moody, shadows on the wall, nothing flashy but feels personal, like you’re right there in the room with them.