Afraid her boyfriend will dump her for being bad at sex, my cheeky adult sister urgently asks me to help her practice. I refuse because we are siblings, but she insists that plastic wrap between us makes it safe. Wrapped kisses and blowjobs soon escalate into full penetration through the film. It feels so good that she bucks hard, tearing the plastic and causing an accidental creampie. Just when I panic, she smiles and says, "Practicing through plastic wrap doesn't really count after all, does it?"