When large amounts of enema fluid are repeatedly injected, the anus twitches sensitively, signaling it's ready to accept penetration. The man catches this cue and violently thrusts his thick cock deep into the woman's anus. Unable to hold back, the enema fluid erupts from her ass—sometimes gushing like a powerful waterfall, other times spraying like a fine mist. These fleeting moments of intense pleasure drive both of their desires higher and higher.