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2:3 5_fingers 5_toes absurd_res against_surface anal anal_orgasm anal_penetration anthro anthro_on_anthro anthro_penetrated anthro_penetrating anthro_penetrating_anthro balls belly bent_legs big_balls big_belly big_penis blush bodily_fluids butt cum cum_from_ass cum_in_ass cum_inflation cum_inside cum_on_balls cum_on_penis cum_overflow cum_while_penetrated cumshot curling_toes digital_media_(artwork)duo echidna ejaculation erection eulipotyphlan fan_character fangs feet fingers from_front_position fur fusion genital_fluids genitals hair hands-free hedgehog hi_res holding_partner huge_penis humanoid_feet humanoid_genitalia humanoid_penis impregnation inflation internal internal_anal interspecies knuckles_the_echidna krazyelf looking_pleasured male male/male male_impregnating_male male_impregnation male_penetrated male_penetrating male_penetrating_male mammal monotreme muscular muscular_anthro muscular_male narrowed_eyes navel nude open_mouth orgasm orgasm_face ovum penetration penile penile_penetration penis plantigrade rough_sex saliva saliva_string sega sex smile soles sonic_the_hedgehog_(series)sperm_cell spread_legs spreading standing standing_sex sweat sweatdrop tail teeth toes tongue tongue_out vein veiny_penis werecreature wereeulipotyphlan werehog