Rule 34 Dev - all_fours anal anal_sex anthro balls blue_eyes canine caramelthecalf clenched_teeth clothing duo echidna embrace erection eye_contact footwear fox fur gloves grin knuckles_the_echidna looking_back lying male male_penetrating mammal monotreme on_front penetration penis purple_eyes sex shoes smile sonic_(series) tails teeth yaoi|3094829440