Knux123
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A Sonic the Hedgehog and Helluva Boss crossover fanfic.
After the events of Sonic Frontiers; during an encounter with Eggman, the doctor tells Sonic and his friends that he has been researching the Imp Demon species race from Hell.
A few days later, the blue hedgehog finds himself in an encounter with the Immediate Murder Professionals, who overpower a off guard Sonic with their utility of gunfire and weaponry. It almost kills Sonic, to the point where he goes through a panic attack. So to put his mind at ease, Sonic decides he's going to adopt a therapy dog. But while at the adoption center, Sonic discovers an extraordinary hellhound orphan who appears to be anthropomorphic just like him. She looks like she's barely enjoyed herself here. He could see the fear and desperation in her eyes. But how will this hellhound change Sonic's life for better or worse?
(To understand the context of this fanfic, I highly recommend playing the modern Sonic games, reading the IDW Sonic comics, and watching some Helluva Boss episodes. These things are REALLY important for you to understand the context of this fanfic.)