This request's pretty straightforward; I basically want Ichigo to be a teacher in this one. I want Ichigo, post TYBW, (as well as after the epilogue of Bleach), to become a teacher in Kuoh town. Kisuke has already informed Ichigo of the existence of several other supernatural related factions and the history of the biblical factions, so the devils living in Kuoh come as no surprise to him. The devils, naturally, are interested in Ichigo, and eventually they witness him arriving to save Issei. He's there too late, however, and so Issei has to choose between whether he becomes a soul reaper like Ichigo or a devil like Rias. I'll leave it up to you to decide which of those two options he chooses. Ichigo will change several events in the plot of DxD, such as the battle with Kokabiel or rating game against Riser. (Via training Rias's peerage to be a lot better.) The soul society, hueco mundo, the race of quincies, and any other Bleach related groups such as bounts, will be considered isolated pantheons that don't really interact with the other factions. This is, in fact, due to the soul king not allowing the soul reapers to know about their existences in the first place, including Yamamoto. The hollows don't know about them because they mostly don't care, and the quincies don't know because of Yhwach not allowing them to know. Kisuke only knows because he's Kisuke, and because the soul king allowed him to know.