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anal anal_penetration anthro avian beak bird breasts double_anal double_penetration eyewear female fourssss genitals glasses group hi_res hirundinid humanoid_genitalia humanoid_penis looking_pleasured male male/female monochrome nipples non-mammal_nipples oscine passerine penetration penis presenting sega sketch sonic_riders sonic_the_hedgehog_(series)spread_legs spreading swallow_(bird)trio vulva wave_the_swallow