Rule 34 Dev - 4_toes 5_fingers animal_genitalia anthro athletic athletic_anthro athletic_male balls beak beak_growth chest_tuft claws consensual_transformation digitigrade erection feathers feet finger_claws fingers fur fur_growth genital_transformation genitals growth happy human_to_anthro hybrid_genitalia hybrid_penis knot looking_at_self male mid_transformation navel nude open_mouth pawpads paws penis scale_growth scales sheath smile solo species_transformation standing tail toe_claws toes transformation tuft sabretoothed_ermine mythology velux avian gryphon human mammal mythological_avian mythological_creature 2012 line_art monochrome signature|23297209565