Sweet Secrets (1977)

One of the brunettes has long dark hair and a slim waist, riding the guy hard in the beginning before flipping into doggy. The other girl’s got shorter hair, pale skin, and doesn’t wait her turn — she’s already jerking him off while her friend finishes up. They switch between 69 and missionary, both taking turns deep-throating him while he nails them from behind. The close-up shots during the blowjob are brutal — gag reflex, eyes watering, slobber running down his shaft. You can tell they’re going all-in, not just pretending. Camera stays tight on the action, mostly POV and close angles, no wasted shots.