Idea1 : (Highshcool DXD)

MC and friend die by truck-kun, enconter GOD who offer 3 wish for both

MC had an idee, why not High scool dxd 4 year before the birth of rias and sona

MC has rias older brother with the body of suoh mikoto(k project)

And friend has sona older brother with body of Reisi Munakata(k project)

1wish: power of destruction(gremori) + flame = flame of suoh mikoto for MC

2wish: power of water(sitri) + barriere = water defence of reisi munakata for Friend

3wish: experience of their futur body for both of theim

both devils MC and friend behave like suoh mikoto and reisi munkata