In the throes of a fantasy, a stepsister slips into the bathroom, her wet t-shirt translucent, nipples hard. Her stepbrother, already aroused, can't take his eyes off her. She playfully douses him with water, laughing as he chases her. Cornered, she presses against him, feeling his hardness. Their breaths hitch as they share a first, tentative kiss. Her hands roam, untying his towel, freeing his cock. She guides him to her entrance, gasping as he slides in, filling her completely. They fuck hard and fast, their wet bodies slapping together, until they're both spent and panting.