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anthro big_butt big_penis bodily_fluids butt duo equid equine erection faceless_character faceless_female faceless_male female female_penetrated first_person_view genital_fluids genitals hand_on_butt horse male male/female male_penetrating male_penetrating_female male_pov mammal monochrome morningstarlewds muscular muscular_male penetration penile penile_penetration penis penis_in_vagina sex sketch thick_thighs vaginal vaginal_fluids vaginal_penetration vein