Illusions Within Girls (1977)

Two young blonde girls start off in a tight 69 on a bed — one’s short-haired and slim, the other has longer hair and a curvier frame with big tits that hang slightly as she leans over. They’re eating each other out hard, tongues working in circles, close-up shots letting you see every flick and suck. After the girl-on-girl action, the scene shifts: the short-haired blonde is now on her knees, taking a guy’s dick deep in her throat, cheeks puffing as she gags a little. He’s muscular, dark-haired, sits back in an office chair while she works him, eyes locked. Later, the two girls are seen together again, laughing and talking like they’re comfortable around each other — adds a real, lived-in vibe. Camera stays tight during sex, mostly side angles, dim lighting but clear enough to catch the details.