Dear Throat (1973)

A slim blonde with long hair and a tan is on her knees, sucking a guy’s dick while he sits back on a couch, one hand resting on her head. She goes deep, gagging slightly as the camera holds tight — you see every inch disappear. Behind them, a brunette with dark long hair watches, then takes over, switching up the rhythm with slower, more deliberate strokes. They alternate, both wearing simple lingerie, lights low but not dark — shows their faces clearly during the blowjobs. The guy stays passive, letting them dominate the pace, which keeps it focused on their mouth action and facial expressions. One shot shows the blonde from behind, her ass hanging out, as the brunette deepthroats and pulls back with a string of spit.