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1:1 anthro bed breasts cylent_nite duo echidna erection eulipotyphlan female female_penetrated furniture genitals hedgehog lying male male/female male_penetrating male_penetrating_female mammal monotreme nipples penetration penile penile_penetration penis penis_in_vagina sega sex shadow_the_hedgehog sonic_adventure sonic_the_hedgehog_(series)tikal_the_echidna vaginal vaginal_penetration