FURVERT!

2017 3:5 abs abstract_background anthro balls biceps biped black_hair bottomwear bottomwear_down brown_body brown_skin canid canine canis castbound clothed clothing countershading domestic_dog erection flexing genitals hair hi_res looking_at_viewer male mammal muscular muscular_anthro muscular_male pants pants_down partially_clothed pecs penis penis_base pubes russell_(castbound)smile smirk solo standing tight_clothing triceps undressing vein veiny_penis