Blackmail For Daddy (1975)

Stepdad gets blackmailed by his stepdaughter, and it doesn’t take long before clothes are off. She’s a slim brunette with long hair, pale skin, and a tight body — looks young, early 20s, maybe late teen. He’s an older white guy, shaved head, muscular build, looks like he works out. Starts with her giving him a blowjob on the bed, deep throat, messy, you can see the tension in his face like he knows this is wrong but can’t stop. Then it flips to missionary — she’s on her back, legs up, taking it deep, moaning like she’s into it for real. Some solo stuff in between where she jerks off with a dildo while reading on the bed, showing off her pussy, playing the innocent girl who’s actually a total hornbag. Camera stays tight, mostly close-ups, dim lighting but clear focus on faces and cock. The blackmail plot’s flimsy, but the sex isn’t — she rides him later, up and down, grinding slow then picking up speed. Ends with him cumming on her tits. No wild acrobatics, just solid, sleazy home-video vibes.