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1:1 2014 absurd_res anthro balls bodily_fluids brown_rat erection genitals hi_res humanoid_genitalia humanoid_penis looking_at_viewer male mammal master_splinter murid murine nude penis rat rodent signature solo sweat teenage_mutant_ninja_turtles teenage_mutant_ninja_turtles_(2003)unknown_artist unknown_artist_signature vein veiny_penis