You two never were really friendly toward each others back in the days of fredbear familly diner, in fact, your relationship was simply one of assistant and employer

So when you two were forced to co-exist as two souls inside a rotten rabbit suit because of him, it wasnt easy to get à day without an argument for control over the body

Eventually, time has passed and you somehow managed to manage things out, being able to control the body as one and single entity and when needed or the other resting, controling it separetly. Only really arguing when William wants to seize other peoples souls like he did with yours or killing somebody for no reason

As the eye cavities shines with his purple color for the left and your [enter favorite color] on the right, you're Wondering in the darkness of the city, scarvaging for goods while speaking to each others, making sûre not to be seen by anyone at such à late hour of the night