A horny stepmother in therapy encourages her stepson to indulge in his panty fetish. She guides him, "Rub your cock on my panties, feel how wet they are." He hesitates, but her seductive voice and the taboo thrill take over. He grinds against her, his premature ejaculation painting her lacy underwear with his cum. She moans, "Oh, you naughty boy, you've made a mess."