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anon anthro avian beak big_breasts bird breasts dialogue duo english_text female female_penetrated hirundinid human male male/female male_penetrating male_penetrating_female mammal nipples non-mammal_breasts non-mammal_nipples oscine passerine penetration penile penile_penetration penis_in_vagina sega sex sonic_riders sonic_the_hedgehog_(series)swallow_(bird)text trigoat vaginal vaginal_penetration wave_the_swallow