Penthouse: Pet Rocks (1995)

Blonde with massive natural tits and a slim waist is tied up on a dark bed, wrists locked above her head. The brunette—smaller tits, long straight hair—sits next to her pulling a chain connected to nipple clamps. You see the blonde wince and arch every time the chain tugs. Later they switch; the brunette gets on her knees and sucks a dildo while the blonde watches, still wearing the restraints. Camera stays low, so you’re right there in the shadows with them. Lighting is dim, just enough to see the sweat on their skin and the way the blonde’s tits jiggle when she struggles. No fluff, just slow, heavy BDSM with a focus on the clamps and the way the brunette teases her.