Leda Lothario, the younger stepsister, is a virgin, but Serena Blair is determined to change that. She starts by sucking Leda's perky tits, making her squirm with new sensations. Then, she fingers Leda's tight pussy, bringing her to a squirting orgasm. Leda, eager to learn, reciprocates, her innocent touch driving Serena wild. They kiss, their tongues exploring each other's mouths, before Serena face-sits Leda, bringing her to another squirting climax. The sisters, now bound by more than blood, collapse in a tangle of limbs and spent juices.