Rule 34 Dev - abs anthro athletic athletic_anthro athletic_male beak biceps bottomwear clothing feathers growth human_to_anthro male muscle_growth muscular muscular_anthro muscular_male navel nipples open_beak open_mouth pants pecs solo species_transformation standing tail_feathers tongue topwear torn_bottomwear torn_clothing transformation triceps birdovo avian bird hi_res|84461960