So many good sex/rape scenes here! Personally I loved when Lucretia owned Crixus against his will and he had to please her in ways her husband could not... but my absolute FAVORITE dynamic is near the end when Marcus Licinius Crassus owns Sinuessa and keeps her for her entire like against her will until she submits and raises his and his wife's son (who later rapes her) but always Marcus keeps her close to him always, even closer than he keeps his wife as she has learned what his needs are and she performs for him as needed.
What is your favorite scene/relationship in this show?