Promise (Obey me x gn reader)

It was MC's birthday, you thought it'd be the same as every year but that changed when you were teleported to the Devildom. From there, you decide to stay to keep MC company, though, over time you notice that wasn't necessary. As MC quickly becomes friends with the brothers and you were often forgotten about. You busy yourself by getting a job and befriending the school 'delinquent', Karasu. You thought this was how it was going to be the whole year, but Lucifer is hiding something and MC is hellbent on finding out what it is. You don't feel the same as before. Something within you is different and you're not sure if it's a good thing...