As days turn into weeks of isolation, a young man's hormones rage, fueling his most carnal fantasies. 'Alguna cuarentona,' a woman of mature years and unbridled passion, becomes his muse. He envisions her body, ripe and ready, as he pleasures himself. His solo sessions grow more intense, his imagination painting vivid scenes of her taking his cock, her experienced hands guiding him. The confines of his room become a stage for their unspoken, forbidden trysts.