“We promised sex was the one thing we would never do, right?” Two married adults begin a secret double affair as masturbation partners, showing each other their private sessions while insisting that no penetration means it is not really cheating. After three months of watching and teasing without ever crossing that final line, their desire explodes into one last sex session. She hesitates—“Are we really going to do this? We won’t be able to meet again”—before their first and final encounter becomes an uninhibited marathon of sex and repeated creampies.