Rule 34 Dev - 1boy 2014 animal_genitalia anthro balls biceps big_penis bodypaint erection fishbook5 glans grey_skin hendrik hi_res horn humanoid_penis looking_at_viewer male male_only mammal markings musclegut muscular muscular_male navel nipples nude omari pecs penis pose purple_background rhinoceros scar simple_background sitting slightly_chubby smile solo tail_tuft tribal tuft vein|2485424528