As their parents' voices fade away, the siblings give in to their taboo urges. The brother unzips his pants, his thick cock springing free, already leaking pre-cum. The sister, her panties soaked with her own excitement, hikes up her dress and straddles him, impaling herself on his length. They move slowly, trying to keep quiet, but their moans of pleasure fill the closet. They climax together, their bodies shuddering, their hearts pounding with the thrill of their shared secret.