Marcio, home from work, finds his wife, Marcela, masturbating on their bed, her fingers dancing over her clit, her moans filling the room. He watches, hard, as she arches her back, her body tensing with pleasure. She sees him, but instead of stopping, she beckons him closer. 'Watch, Marcio,' she purrs, 'or join me.' He hesitates, torn between his desire and his role as a cuckold. She continues, her self-pleasure a cruel tease, her eyes locked onto his.