(Maruhi) Ôoku Gaiden: Horegusuri Onna Kyôran (1973)

One of the women has a tight black updo and wears traditional Japanese robes, lying back on a futon with her legs spread while the other girl goes down on her. The camera lingers on the oral work — slow, deliberate licking with close-ups showing wet lips and glistening folds. They switch spots halfway, both taking turns eating each other out in a dimly lit room with paper sliding doors and purple ambient light. The guy shows up later, mid-20s, short black hair, also in traditional garb, watching before joining in. He fucks one of the women from behind in doggy style while the other jerks him off with one hand, still wearing her robe open. The whole thing feels staged like a period piece but with raw, up-close sex shots — especially the facial expressions during climax.