Dosei Jidai: Kyoko to Jiro (1973)

Kyoko’s on all fours, ass in the air, Jiro hammering her from behind in a sweaty, slow-building doggy style session. The lighting’s low — looks like their living room — with soft shadows on the walls and bottles on the table from earlier. She’s got short dark hair, slim frame, and takes it deep without making a show of it — real quiet moans, not overacted. Jiro pulls out a few times, strokes himself with one hand, then shoves back in. Later they switch to missionary, face-to-face, her legs up over his arms while they talk quietly between thrusts. There’s another woman briefly — dark ponytail, in a medical office — but she doesn’t stick around for the sex. Camera stays tight, medium shots, nothing shaky. Just straight-up fucking with no fluff.