twstacker (character), all fours, anal, anal sex, anthro, anus, avian, backsack, balls, beak, bird, blush, doggy style, duo, erection, feathers, from behind position, grey feathers, imminent knotting, knot, looking pleasured, male, penetration, sex, tail feathers, tail grab, white feathers, yaoi, yggiiggy,

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