rule 34 anal anal masturbation anal sex animal genitalia animal penis anus autopenetration black body black markings black skin cetacean corvus ollydolphin delphinoid detailed background digital media artwork dorsal fin erection feral fin genitals half closed eyes hi res looking back male male penetrated male penetrating mammal marine markings masturbation mottled mottled genitalia mottled penis narrowed eyes nude oceanic dolphin ollydolphin open mouth open smile orca penetration penile penile masturbation penis pink genitals pink penis signature smile solo solo male speech bubble spots teeth text toothed whale underwater water white markings yellow eyes 5424314