FURVERT!

abs anthro anthro_on_anthro balls big_penis biped comic duo english_text equid equine erection fingers freckles_(artist)genitals glans horse huge_penis intraspecies male male/male mammal medial_ring monochrome muscular muscular_anthro muscular_male open_mouth open_smile pecs penis penis_size_difference smile speech_bubble tail text tongue tongue_out vein veiny_penis