Sigma somehow gets convinced by one of his patrons to try and summon a demon to guard the Sky Casino. A Hellhound specifically. But when that goes wrong and Sigma ends up with a small fluffy baby Hellhound instead he (with many regrets) enlists Nikolai's help to take care of it, as he can't manage on his own. Or Sigma and Nikolai look after a demon puppy, chaos ensues a short fluffy fic I felt like writing :]