Rule34https://rule34.xxx/index.php?page=atom&tags=1boy all fours anthro anus argento backsack balls clothing echidna erection gloves half-closed eyes humanoid penis knuckles the echidna looking at viewer looking back male male only mammal monotreme penis perineum presenting purple background raised leg shirt signature simple background smile solo sonic (series)2024-05-02T22:30:42ZRule34