argento, knuckles the echidna, sonic (series), purple background, simple background, 1boy, all fours, anthro, anus, backsack, balls, clothing, echidna, erection, gloves, half-closed eyes, humanoid penis, looking at viewer, looking back, male, male only, mammal, monotreme, penis, perineum, presenting, raised leg, shirt, signature, smile, solo,

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