The Big ImageBoard (TBIB) - 4 fingers age difference all fours anal anal penetration anthro anthro on anthro anthro penetrated anthro penetrating anthro penetrating anthro black nose blue body blue fur blue hair blue tail bobbie (rotten robbie) brother (lore) brother penetrating brother brothers (lore) canid canine canis cheek tuft clenched teeth countershade face countershade tail countershade torso countershading digital media (artwork) doggystyle dominant dominant male duo ears back eyebrows eyes closed facial tuft fingers flat colors from behind position fur grey body grey fur grey tail hair half-closed eyes head grab head tuft incest (lore) larger male looking back lying male male/male male penetrated male penetrating male penetrating male mammal multicolored body multicolored fur narrowed eyes nude older male on front open mouth penetration penile penile penetration penis in ass pink tongue pinned pivoted ears questionable consent robbie (rotten robbie) rotten robbie rough sex sex sibling (lore) side view simple background size difference smaller male tail teeth tongue tongue out tuft two tone body two tone fur two tone tail white background wolf younger male younger penetrated