After Becoming a Demon of Hell, I Tried Torture #1 (Ka Y Souken)

Queen Tetous endures relentless sexual torment and degradation at the hands of her shapeshifting jailer, Pyaba, who promises a grim "promotion" for her compliance. Meanwhile, Lord Enma visits the torturer Tarou to enlist his skilled services for a particularly troublesome sinner. As Tarou confidently accepts the request, Tetous's brutal training continues without respite.