Orc not obedient? Then I'll replace it

Luke Vain, the lowest-ranking janitor at Asgard’s Academy of Magic, was derided by everyone as a worthless “magical zero.” That was until one day, an ancient magical book opened before him, bestowing upon him a forbidden soul mark – capable of binding any creature of the opposite gender! In the span of a single night, the aloof and beautiful academy prodigy, Julia, became his contracted beast; the proud and reclusive guardian, the millennia-old queen of mythical creatures, and even the grand judge of the celestial court above were all unable to escape his “training” and contracts. From then on, the goddesses fought on his behalf, and he simply enjoyed the victory!