abs anthro athletic bdsm beak biceps big_deltoids bodily_fluids bondage bound clothing cuff_(restraint) deltoids feathers growth laboratory male muscle_growth muscular muscular_anthro muscular_male navel neck_muscles nipples pecs restraints ripped_muscles shocked solo sweat test_subject thong triceps underwear veiny_muscles birdovo avian bird hi_res
Intensive growth of the test subject bird.