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against_surface against_wall anthro anthro_on_anthro anus big_butt biped blaze_the_cat blush butt corner detailed_background domestic_cat duo echidna excito faceless_anthro faceless_character faceless_male felid feline felis female genitals grey_anus grey_wall hi_res imminent_sex knuckles_the_echidna looking_back male male/female mammal monotreme mostly_offscreen_character nude penis plump_labia presenting purple_butt purple_vulva sega solo_focus sonic_the_hedgehog_(series)vein veiny_penis vulva wall_(structure)