The Last Temptation of Kristi (1988)

Kristi, a slim blonde with curly hair and small tits, starts off making out with another slim blonde girl on a yellow shirt in a dim living room. They go at it fully nude — licking, grinding, eating each other out with their legs spread wide on the couch. The camera sticks close during the cunnilingus, showing lots of wet pussy action and fingering from both angles. Then a short-haired brown guy with a muscular build takes over, sliding into Kristi from behind in doggy style, balls slapping with each thrust. She switches to riding him reverse cowgirl, bouncing slow at first then speeding up, her ass jiggling with every up-and-down. Final scene has them in missionary, face-to-face, deep kissing while he plows her — she’s moaning loud, looks completely flushed and into it.