Los claros motivos del deseo (1977)

One of the girls has short dark hair and a tight little body — she’s the one getting her pussy eaten in the dim hallway shot. They start off fully clothed on what looks like a late-night bus or train, just making out hard, hands roaming under jackets. The transition to the hallway happens fast — no talking, just action — and she’s bent over a metal gate while the other goes down on her from behind. You see a lot of tongue work, close-up, with shaky handheld framing like it’s shot raw. Later there’s a shot of a guy in a dark room holding a blue glowing object, looks like some kind of electronic device, but he doesn’t interact with the girls. The light in the intimate scenes is low but clear enough to see textures and movement — no faking, they’re really going at it.