Chikubi ni piasu o shita onna (1983)

Skinny Asian girl with long black hair and small tits is getting pounded by a muscular Asian dude with short hair. They start in a dim bedroom, him on top, grinding slow at first but quickly picking up pace — you can hear the slapping from behind the camera. Later they’re in what looks like a restaurant, wrapped up in each other’s arms, kissing deep before cutting to them going at it on the bathroom floor, her back against the tiles, legs up. He eats her out briefly, tongue work is decent — not amazing, but she’s moaning like it feels good. The whole thing’s shot with a low-light, almost voyeuristic vibe — feels like you’re watching something private. Nothing wild or cinematic, just straight-up sex with a focus on close-ups during penetration.