Rule 34 Dev - 2020 animal_genitalia animal_penis anthro_to_feral avian backsack balls beak blush cheetah collar collar_only digitigrade erection feathered_wings feathers felid feline feline_penis fully_sheathed genitals gryphon hybrid male mammal mythological_avian mythology penis sequence sheath sheetah solo species_transformation spiked_penis spikes standing strawberrytfs surprise talons tongue tongue_out transformation wing_growth wings|4119318376