竜族生態調査班, 2015, black and white, comic, greyscale, japanese text, monochrome, simple background, text, translation request, abs, anthro, bondage, bound, claws, clenched teeth, coat, collar, dragon, fangs, fear, fully bound, gag, gagged, horn, human, lab (disambiguation), laboratory, larger anthro, larger male, male, male only, mammal, metal, muscular, navel, nude, panting, pecs, reptile, scalie, sharp teeth, size difference, slit, slit insertion, slit penetration, slit play, smaller human, smaller male, spreader toy, spreading slit, steam, teeth,

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