Nureta tsubo (1976)

Starts with a skinny South Asian girl with long straight black hair stripping down in a hotel room—small tits, visible ribs, and that tight little frame. She’s not alone for long. A white brunette with loose waves and a toned body joins in, bending over to suck a dude’s cock while another chick gets eaten out on the bed. The camera catches everything: close-ups of the brunette’s mouth working the shaft, the Asian girl’s legs spread wide while a guy goes down on her. Later, it turns into a full-on orgy—one girl riding reverse cowgirl, another getting pounded doggy style, and the two dudes switching between them. Lighting’s dim but sharp enough to see every detail, especially the way the Asian girl’s small tits bounce when she’s getting fucked. No fluff, just raw group action with a mix of body types and positions.