Tsumatachi no gogo wa yori: kannō no ori (1976)

One of the girls has short black hair and a petite frame — she’s the first to climb on top, grinding slow and deliberate over her partner’s pelvis. They’re both fully naked on a messy bed, dim light coming from a window behind them, giving everything a hazy afternoon vibe. The other girl’s got a bit more curve to her hips, lying back and pulling her friend down by the waist, focusing on face and chest contact. The camera stays static but tight, catching every shift in expression, especially when one goes down on the other with her fingers already working. There’s no talking, just natural sounds and movement, like they’re really in the moment. The whole thing feels private, not staged — more about slow buildup than fast fucking.