A committed partner gets cheated on while someone else fucks their lover, and the story lingers on the betrayal and humiliation. The unfaithful one usually looks thrilled and shameless, while the person being cheated on gets reduced to watching, finding out too late, or being emotionally crushed as the other guy takes over. A lot of scenes lean hard into cuck vibes, with explicit fucking, dirty talk, and a nasty contrast between secret pleasure and public heartbreak.