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anal anal_penetration anthro anthro_on_anthro aquatic areola bodily_fluids brown_body countershade_face countershade_torso countershading duo fish genital_fluids genitals glans grey_body hi_res humanoid_genitalia humanoid_penis interspecies male male/male masterelrest muscular muscular_anthro muscular_male nipples penetration penis precum scalie shark vein veiny_penis