anthro anus backsack balls beak blush butt erection feathers genitals humanoid_genitalia humanoid_penis inside looking_at_viewer looking_back looking_back_at_viewer male nude penis penis_tuck presenting presenting_anus presenting_hindquarters raised_tail rear_view scuted_legs scutes solo tail_feathers thick_thighs window yellow_eyes bananda2 avian gryphon mythological_avian