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2020 2d_animation abdominal_bulge ambiguous_penetration animated animated_gif anthro black_nose bovid bovine breasts cattle cervine deer duo erection exercise female female_penetrated fitness frame_by_frame genitals larger_male loop low_res male male/female male_penetrating male_penetrating_female mammal penetration penis sex short_playtime size_difference smaller_female smaller_penetrated trainer training unusual_position vylfgor