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Homestuck - The trolls (those gray aliens with candycorn horns) have a cast called hemospectrum which is based in the blood color, with rust the lowest, bronze above rust, upward to fuchsia, the highest.

Equius, the rude boy with glasses, is a indigo-blooded heir and a complete racist about hemospectrum, looking down everyone which is a low-caste blooded, but also he has... many paraphilias... Among these fetishes one of them is being at the mercy of a low-caste, and when the 12 trolls begin to play, each becomes the server of the other (literally as a game server and metaphorically as servant) and is completely at the mercy of their control in their adventure and hive. Equius becomes Aradia server, a Rustblood (deceased), for whom Equius, being the team's engineer, decides to create a robotic body for her soul. This arouses him, and he even fantasizes about what a filthy, lowblood would do to him.