FURVERT!

abstract_background animal_genitalia anthro balls biped black_balls black_body black_claws black_fur black_hair black_nose black_sheath blue_eyes canid canine canine_genitalia canis claws full_moon fully_sheathed fur genitals grey_balls grey_body grey_fur hair ice ice_block ice_wolf_(undertale)male mammal moon muscular muscular_anthro muscular_male night nude sheath sheath_tuft sky solo standing star starry_sky tail tuft undertale undertale_(series)wolf yaroul