A curious step-brother asks his older step-sister for help with his biology homework, eager to learn about sex and the female body. She agrees—but only if he shows his cock in return. Dressed in a pleated skirt and tight black tights with no panties, she starts by rubbing her pussy over the fabric, then pulls the tights aside to use a dildo on her wet slit, demonstrating how penetration works. A butt plug in her arse reveals her secret thrill—one she admits is meant to prepare her for cock. After they both climax, she accuses him of stealing her used tights from the laundry, then makes a deal: she’ll give him a fresh pair every night, and in return, he’ll return them after use. If he behaves, there may be more lessons—and real access to her body.